Meet Our Founders


Cyrus Khambatta, PhD

Cofounder, Living with Type 1 Diabetes

Cyrus Khambatta, PhD earned a Bachelor of Science in Mechanical Engineering from Stanford University in 2003, then earned a PhD in Nutritional Biochemistry from the University of California at Berkeley in 2012. He is the co-author of many peer-reviewed scientific publications.

He is the co-founder of Mastering Diabetes and Amla Green, and is an internationally recognized nutrition and fitness coach who has been living with type 1 diabetes since 2002. He co-created the Mastering Diabetes Method to reverse insulin resistance in all forms of diabetes, and has helped more than 10,000 people improve their metabolic health using low-fat, plant-based, whole-food nutrition, intermittent fasting, and exercise.

He is the co-host of the annual Mastering Diabetes Online Summit, a featured speaker at the Plant-Based Nutrition and Healthcare Conference (PBNHC), the American College of Lifestyle Medicine Conference (ACLM), Plant Stock, the Torrance Memorial Medical Center, and has been featured on NPR, KQED, Forks Over Knives, Healthline, Fast Company, Diet Fiction, and the wildly popular podcasts Plant Proof and Nutrition Rounds. He is a co-author of the upcoming book Mastering Diabetes with Robby Barbaro, MPH.


Robby Barbaro, MPH

Cofounder, Living with Type 1 Diabetes

Robby Barbaro, MPH graduated from the University of Florida and is the cofounder of Mastering Diabetes and Amla Green. He worked at Forks Over Knives for six years before turning his attention in 2016 to coaching people with diabetes full time.

Robby was diagnosed with type 1 diabetes at the age of 12 and has been living this lifestyle since 2006. In that time, while eating pounds of fruit every day, his HbA1c value has never exceeded 6.4%, and his blood glucose has been stable and easy to manage.

He is the co-host of the annual Mastering Diabetes Online Summit, a featured speaker at Whole Foods Global Headquarters, VegFest LAPlant-Stock, Torrance Memorial Medical Center, and has been featured on Forks Over KnivesHealthlineMedical MediumViceThrive MagazineDiet FictionThrive GlobalBestLife and the wildly popular podcasts Plant Proof and Nutrition Rounds, and is the author of the upcoming book Mastering Diabetes with Cyrus Khambatta, PhD.

Robby enjoys exercising every day, spending time with friends, and sharing his lifestyle on Instagram, Facebook and YouTube.

Meet Our Coaches

Kylie Buckner, RN, MSN

Director of Lifestyle Change.

Masters of Science in Nursing, Registered Nurse

Kylie Buckner is a registered nurse and has a master’s degree in nursing education. She has more than 18 years of experience as a nurse in the neonatal intensive care unit, in labor and delivery, in OB-GYN, and in pediatrics.

She has dedicated her life to caring for people as a nurse and has an in-depth understanding of the challenges of adopting a plant-based lifestyle. She is also a certified yoga teacher and has been 100% plant-based for over 6 years.


Marc Ramirez

Diabetes Coach, Reversed Type 2 Diabetes

Marc Ramirez is a former University of Michigan Football player who reversed type 2 diabetes, high cholesterol, high blood pressure, erectile dysfunction, psoriasis, and frequent heartburn using a low-fat, plant-based, whole-food diet. 

He lost 50 pounds in 3 months, and in that same time period he eliminated 5 medications that he had been taking for 10 years. He is certified through the Physicians Committee for Responsible Medicine (PCRM) as a Food For Life Instructor and conducts classes and 21-Day Kickstarts to help people improve their health. He also appears in the new documentary Eating You Alive.

Wendi Sullivan MA, RDN, CDCES

Diabetes Coach, Registered Dietitian/Nutritionist, and Certified Diabetes Care and Education Specialist, Living with Type 1 Diabetes

Wendi's passion for helping people with diabetes goes back to when her Dad was suddenly diagnosed with Type 1 diabetes when she was 12 years old. Her whole family's diet immediately changed to help her Dad become healthy again. Wendi was later diagnosed at age 21 with type 1 diabetes. She was inspired to become a registered dietitian and certified diabetes care and education specialist to work with people who have diabetes.

Wendi graduated with both her bachelor's and master's degrees in nutrition from Western Michigan University. She has worked with people with diabetes for over 13 years. Wendi loves her nutritious lifestyle!

Natalie Goodwin, MS, RD

Diabetes Coach, Registered Dietitian, Bachelors Biochemistry, Master's in Community Nutrition

Natalie is a Registered Dietitian who has earned a Bachelor's degree in biochemistry and a Master's degree in Community Nutrition. Her professional background in hospital-based clinical nutrition has provided her with experience working with people with a wide range of health concerns.

She has been plant-based for over 7 years and is passionate about helping others take control of their health through diet and lifestyle. She can usually be found working in her garden, rock climbing, or caring for her ever-growing flock of rescue chickens in her spare time. 

Michelle King Davis, BA Education

Diabetes Coach, Certified Health Coach & Personal Trainer

Michelle began a plant-based journey over 20 years ago in response to health
challenges. She became an avid studier of evidence-based nutrition and still
considers herself a lifelong learner. In the early 2000’s she co-authored the book,
Never Be Fat Again. She spent over a decade coaching hundreds, including people living with prediabetes and type 2 diabetes, in transitioning to a whole-food, plant-based lifestyle having dedicated her life to helping others thrive, she is excited to be part of the Mastering Diabetes coaching team.

Andrea Woton MPH, RDN

Diabetes Coach, Registered Dietitian/Nutritionist, Masters in Public Health

Andrea earned her Bachelor of Arts degree in Economics from Stanford University and spent the first 10 years of her professional life working as an Investment Banker to technology companies in Silicon Valley and other regions of the nation and world.

Andrea resigned from investment banking because she knew that her purpose was elsewhere. She discovered whole food plant-based diets (wfpb) out of a desire to protect animals and the earth and then learned about the extraordinary health benefits of a wfpb lifestyle. She was hooked and decided to dedicate her life to sharing the miracle of a plant-based lifestyle with others.

She went back to school and earned her Master of Public Health degree in Nutritional Sciences at the University of Michigan School of Public Health (SPH). She then completed her Dietetics training through the UM SPH Dietetics Internship program to become a Registered Dietitian Nutritionist. Andrea founded a telehealth plant-based nutrition coaching practice to help individuals with chronic conditions improve their health by shifting toward wfpb diets. She is now profoundly honored to be a Mastering Diabetes Health Coach.

Paula Allison, RDN, LDN, CDCES

Diabetes Coach, Registered Dietitian/Nutritionist, and Certified Diabetes Care and Education Specialist

Paula has been in the field of Dietetics for over 25 years. During this time, she has practiced in a variety of settings. She has worked as a Clinical Dietitian at a hospital covering an array of services including, Diabetes, Community Nutrition, Pediatric, Cardiac, Renal, and intensive care. She has also worked as a Public Health nutritionist for many years. Paula graduated with a bachelor’s degree in Nutritional Sciences and Dietetics from Plattsburgh State University and completed her Dietetic Internship. She later went on to become a Diabetes Educator.

Her greatest passion is helping many clients achieve their health goals by empowering them through education and support using your food as medicine. 

Amy Leahy, BA Health Sciences in Nutritional & Dietetic Medicine

Diabetes Coach, Nutritionist

Amy Leahy is a degree certified Nutritionist, holding a Bachelor of Health Sciences (BHSc) in Nutritional and Dietetic Medicine. It was through studying the overwhelming evidence about how a plant-based lifestyle can truly change a person’s health that moved Amy from a vegetarian to a fully plant-based lifestyle.

Her passion and drive are to educate & empower others with the knowledge to make the best health choices for themselves. Amy is a passionate keynote speaker and educator on plant-based nutrition in her home country of Australia.

Linda Rukavina, NBC-HWC, INHC

Diabetes Coach, National Board Certified Health & Wellness Coach, Integrative Nutrition Health Coach, living with insulin-dependent Monogenic Diabetes

Linda is certified through the National Board for Health & Wellness Coaches and holds a Lifestyle Medicine Coach (LMC) certificate from the American College of Lifestyle Medicine. She completed her health coach training at the Institute for Integrative Nutrition. She also has a BBA and MBA in Finance. Prior to health coaching, she worked in corporate finance and consulting.

She has been living with diabetes since the age of 30 but didn’t get serious about her health until 2012 when she transitioned to a plant-based diet and watched her A1C fall from 6.7% to 5.8%. She worked for many years to reverse her diabetes with diet and exercise but eventually learned she had low insulin production and started taking insulin. To help with the transition, she did private coaching Mastering Diabetes. The accountability, competence, and confidence she gained were key to her success and the inspiration for her to pursue health coaching. Now she loves empowering others with the life-changing power of whole food plant-based eating and lifestyle change!

Marco Ranzi, MS

Diabetes Coach, MS in Nutrition

Marco, MS holds a Master’s Degree in Nutrition with an emphasis in Human Performance from Logan University to go along with a certificate in Plant-Based Nutrition from Cornell. He is also certified as a National Academy of Sports Medicine Personal Trainer and Sleep Expert and is a Permaculture Design Course graduate. Marco strongly believes in a holistic approach to health and utilizing food as medicine. He has the unique experience of being raised plant-based and has been following this lifestyle for over 20 years.

In 2017 Marco hiked the entire 2,190 miles of the Appalachian Trail powered completely by plants.

He now lives in Costa Rica with his wife Maria where they tend to their gardens and fruit forest with regenerative practices. They enjoy the local beaches and waterfalls in their free time.

Deb Scott, RN

Diabetes Coach, Registered Nurse, National Board Certified Health & Wellness Coach

Deb is passionate about helping people make important lifestyle changes and is certified as a Lifestyle Medicine Coach by the American College of Lifestyle Medicine (ACLM). She originally became interested in the science of behavior change while helping a family member struggling to change their habits after a diagnosis of diabetes and heart failure. Her professional medical training includes a B.S in nursing and experience as a Registered Nurse with a background in cardiac and primary care.

After becoming vegetarian as a teen, Deb adopted a plant-based diet in 2008 for ethical reasons. She advocates using whole food plant-based nutrition for the numerous health benefits and has followed evidence-based science on the subject for years. Utilizing Lifestyle Medicine and its tenets personally helps Deb to thrive and allows her to instill these values in her interactions with clients. She loves to share her passion for using food as medicine and is committed to empowering and educating people on how lifestyle changes can prevent and reverse the chronic diseases taking a huge toll on Americans today.

Jessica Stidham, NBC-HWC, INHC

Diabetes Coach, National Board Certified Health & Wellness Coach, Integrative Nutrition Health Coach, living with Type 1 Diabetes

Jessica is certified through the National Board for Health & Wellness Coaches and she completed her health coach training at the Institute for Integrative Nutrition. She was diagnosed with type 1 diabetes in 1996 when she was 3 years old. She was also diagnosed with celiac disease at a young age.

Jessica began her plant-based journey in 2016 by becoming a client of Cyrus Khambatta when he was running his company, Mangoman Nutrition. She was able to achieve all of her goals such as achieving a 5.4% A1c, losing 50 lbs, and cutting her insulin needs by more than half while eating 300x more carbohydrates. She has the unique experience of being one of the first hires on the Mastering Diabetes team and even helped decide the name of the company. Now she loves empowering others to achieve their goals!

Amanda Pyne

Diabetes Coach, National Board Certified Health & Wellness Coach, Living with Type 1 Diabetes.

Amanda was diagnosed with Type 1 when she was 12 years old. As the only member of her extended family with the disease, she often felt like an outsider. Over the years, she tried every therapy available, but it wasn’t until someone recommended the Mastering Diabetes book that she felt she had found a place to belong. For the first time, she felt like she was in control, not her diabetes. Her A1c is never above 5, and she now has the energy to keep up with her young family.

Amanda has degrees in Dietetic Technology and Health and Wellness Promotion. In November 2022, she passed the board certification to become a National Board Certified Health & Wellness Coach to help others. She also holds certificates in Plant Based Nutrition, Health & Wellness Coaching, Meditation & Mindfulness Teaching, and specialized training as a Lifestyle Coach for the National Diabetes Prevention Program.

Katharine Baker, PhD

Wellness & Weight Loss Coach, Certified by Duke Health & Well-Being

Katharine is an enthusiastic convert to low-fat, whole-food, plant-based nutrition after dropping weight easily for the first time in her life, and improving her energy, fitness, and lab reports. She is grateful for the revolutionary research and accessible advice provided by Cyrus and Robby in the Mastering Programs, and eager to share this life-saving why and how with others. Katharine wants to support your self-empowerment with education, behavior change, and mindfulness. She is attentive to the psychological and emotional aspects of transformation, especially the power of envisioning a new way of well-being.

Certified as a coach by Duke Health & Well-Being, Katharine is pursuing further certification by the National Board for Health & Wellness Coaching. She is a member of the American College of Lifestyle Medicine, and has trained in their Food as Medicine program. She earned a PhD in Religion, Psychology & Culture at Vanderbilt University, learning the impact of beliefs, habits, emotions, and environment on behavior. Previously, she worked at the Cal Turner Program for Moral Leadership in the Professions at Vanderbilt University, where she mentored professional students, and the Vanderbilt Center for Teaching, where she coached faculty members.

John Massengale, RDN, LDN, CDCES

Diabetes Coach, Registered Dietitian/Nutritionist, and Certified Diabetes Care and Education Specialist

John has been a practicing dietitian for over 4 years. After seeing a close family member struggle with their health and wanting to improve his own health, he decided to change careers and become a registered dietitian. After becoming a registered dietitian in 2019, he’s has practiced in a variety of settings. He has worked as a Clinical Dietitian at a hospital, a dialysis clinic, and in a outpatient primary care provider clinic. John graduated with a bachelor’s degree in Human Nutrition and Dietetics at Metropolitan State University in Denver Colorado and completed his Dietetic Internship. He later went on to become a Diabetes Educator and Education Specialist.

In his spare time, he enjoys competes in triathlons and gravel bike endurance races. He completed many triathlons including one Ironman.

His greatest passion is helping many clients achieve their health goals by empowering them through education and support using the power of lifestyle medicine. 

Jenelle Longo, RN, FNP

Certified Health Coach, Registered Nurse, Master of Science Degree as a Family Nurse Practitioner

Jenelle is a certified health coach, Registered Nurse, and holds a master of science degree as a Family Nurse Practitioner. She is certified in Plant-Based Nutrition by eCornell and the T. Colin Campbell Center for Nutrition Studies and is a member of the American College of Lifestyle Medicine.

In 2015, her life took a transformative turn after reading "The China Study" by T. Colin Campbell. This eye-opening read introduced her to the incredible potential of Whole Food Plant-Based (WFPB) nutrition in preventing and even reversing chronic diseases. Eager to delve deeper, she immersed herself in evidence-based articles, books, documentaries, and attended International
Plant-Based Conferences. Inspired by the life-changing benefits she discovered throughout her own plant based journey, Jenelle made it her mission to share the power of WFPB with others, leading her to pursue a career in health coaching.

In her free time Jenelle cherishes her time with family, running outside, practicing yoga and meditation, and listening to podcasts including "Plant Strong" with Rip Esselstyn and “On Purpose” with Jay Shetty.

Meghen De Santa, BC-HWC, MACCP

Board-Certified Health & Wellness Coach, Master's Degree of Medicine in Medical Anthropology & Cross-Cultural Practice

Meghen is a Board-Certified Health & Wellness Coach and holds a Master's degree from Boston University School of Medicine in Medical Anthropology & Cross-Cultural Practice, with additional concentration in Public Health. Meghen discovered a whole foods, plant-based diet after a diagnosis of celiac disease and multiple autoimmune disorders in her late 20s. While struggling with gestational diabetes during her second pregnancy, she began working with Mastering Diabetes as a client. The thrilling outcomes she experienced during the program included a quick 30-point drop in fasting blood glucose, her lowest A1c ever (5.4% upon completion of the program), relief from several autoimmune symptoms, and a healthy baby girl.

Since then, Meghen has earned her certification in Health & Wellness Coaching and has worked to support and empower 125+ clients to reverse their metabolic disease markers and lose weight. She is passionate about gathering the stories & experiences of her clients, troubleshooting any and all challenges, fostering community and connection to support healing, and sharing the evidence-based, life-changing benefits of a plant-based diet.

In her spare time, Meghen loves doing almost anything with family, making pottery & rescuing naughty Siberian huskies.

Meet Our Team


Jose Tejero

Customer Support Specialist and Marketing Assistant

Jose is a plant-based certified health coach with a Bachelor's degree in Exercise Science. His mission is to spread the healing power of plant-based nutrition, exercise, and mindset modifications to conquer diabetes in a natural way.

Jose shares valuable information on how to adopt healthy lifestyle habits, cook delicious plant-based meals, and make exercise part of your daily routine. He is fluent in both English and Spanish.

Alondra‌ ‌Matute‌

Executive Assistant, Customer Success Manager

Alondra Matute started off in our team as an Amla Green support member and since then has grown to be our Executive Assistant and the Customer Success Manager for our Mastering Diabetes clients.

Alondra is passionate about women’s health issues and diabetes health. Living with PCOS and insulin resistance herself, she knows the challenges many experiences as they transition to a low-fat, plant-based, whole-food lifestyle. You can always count on her to welcome you and support you in any regard in your journey in the Mastering Diabetes Coaching Program! 

Jose Roman

Jose Roman, born in Venezuela and currently residing in Peru, is a Freelance Translator and Virtual Assistant.

As a former Civil Engineer student, Jose Roman developed a problem-solving mindset. His attention to detail and interest in constant learning have taken him to acquire skills that would help him perform better as a digital worker, including general design and editing software knowledge. He is also experienced in 3D Modeling and is currently studying programming in his spare time.

Jose Roman currently works behind the scenes on different Mastering Diabetes projects. 

Jennifer Mendez

Customer Support Specialist

Jennifer has been in customer service for over a decade, working with different industries from travel, hospitality, logistics, eCommerce, etc. As part of Mastering Diabetes, she learned how this program can help people and make a difference in this modern day of age. She is passionate about rescuing and fostering animals and has a life-long dream to have her sanctuary someday.

Robby Garais

Customer Support

I’m Robby, an experienced Customer Support Representative who loves helping customers find the right solution for their needs.

For more than 8 years, I’ve helped businesses and clients in the support industry with a knack for connecting with people and providing a positive experience, and making their lives brighter.

Now, in Mastering Diabetes I hope to help you in anything that you may need.

Chelsea Klingenberg

Coaching Enrollment Specialist

Chelsea has been plant-based since 2014 when she went vegan. Since then, holistic health and nutrition have been at the forefront of her passions. She loves chatting with new people and spreading the power of a whole-foods plant-based diet as it has transformed her life tremendously.

When Chelsea is not working, you can catch her roller skating to some groovy tunes or getting creative in the kitchen, whipping up plant-based meals for friends and family.

Jillian Stenzel

Coaching Enrollment Specialist

Jillian’s first foray into plant-based diets began at the age of 16. Throughout her 20s, she traveled across 30 countries and found her consciousness around what she put in her body grew alongside the passport stamps.

In 2017, Jillian went on a low-fat, high fruit diet to combat severe GI issues and symptoms of autoimmune disease. Achieving dramatic results in a short amount of time, Jillian became committed to spreading the message on how low-fat, plant-based diets can transform lives. She now serves as a Coaching Enrollment Specialist, helping people choose the coaching program best suited to their needs.