Our Team of Weight Loss Experts

Boone Hospital Center’s bariatric program has a team of individuals that will help support you along your journey to a healthy lifestyle. Each team member is committed to helping you succeed. We like to think of ourselves as coaches and trainers that will help guide you to a thinner, healthier self. Our goal is to provide excellent care and education. We have put together a comprehensive team that will be involved with your care both before and after surgery.


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Jake Petrosky, MD, Bariatric Medical Director

Dr. Petrosky is a bariatric surgeon specializing in minimally invasive weight loss surgery using laparoscopic techniques and the robotic surgery platform. Dr. Petrosky performs bariatric endoscopy, sleeve gastrectomy, Roux-en-y gastric bypass, as well as revisional procedures. Dr. Petrosky attended medical school at the University of Kansas School of Medicine, completed his General Surgery residency at The Cleveland Clinic Foundation, and completed Fellowship at Geisinger Health System for Advanced MIS/Bariatric/Endoscopy.  After completion of Fellowship, he was awarded Certificates from The Fellowship Council, The American Society of Metabolic and Bariatric Surgeons (ASMBS), and the Society of American Gastrointestinal and Endoscopic Surgeons (SAGES) for the variety and breadth of cases performed during this fellowship. He is an active member of the ASMBS and SAGES. Dr. Petrosky is Board-Certified by the American Board of Surgery, and a Fellow of the American College of Surgeons.


Ryan Strain, MD

Dr. Strain is a bariatric surgeon with a focus on minimally invasive operations and a deliberate focus on patient care. He specializes in gastric bypass and gastric sleeve.
Dr. Strain attended medical school at University of Missouri – Kansas City, completed his general surgery residence at the University of Kansas and his bariatric fellowship at University of Missouri – Columbia. Dr. Strain is board-certified in general surgery. He is a fellow of American College of Surgeons and also a member of the American Society for Metabolic & Bariatric Surgery.

Bariatric Program Manager


Kerrie Warne

Kerrie currently is the Manager of the Bariatric Program at Boone Hospital Center.  Kerrie has worked in the Bariatric field since 2009 and is passionate about impacting positive change in our patient’s lives.  Kerrie has served as a consultant for LapBand, been published in the Bariatric Times twice as well as presented at the National American Society for Metabolic and Bariatric Surgery, (ASMBS), in 2012. She is very active in the Bariatric community both locally and nationally to continue to be a champion for quality care for all of the bariatric patients she serves. Kerrie received her Life Coach Certification in 2012, which has given her the ability to coach countless individuals and groups in reaching their personal and professional goals. She takes pride in being able to help others achieve the best they can be.

Bariatric Clinicians


Jennifer Tveitnes, RD, LD – Bariatric Program Coordinator

Jennifer is our Bariatric Program Coordinator and Registered Dietitian. She graduated from the University of Missouri with a degree in dietetics. She brings more than 13 years of industry experience to improve the health and quality of life of her patients. She acts as the liaison between our team, the surgeons, and the patients to provide the highest quality and continuity of care.

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Allison Arends, MSN, AGNP-C, CBN

Allie is a bariatric certified nurse and nurse practitioner. She brings 10 years of bariatric surgery experience to our team, working in the clinic setting and as a first assistant to our surgeons in the operating room. As a member of both the Obesity Medicine Association and American Society of Metabolic and Bariatric Surgery she is passionate about advocacy and advancement in the field of obesity. She graduated with a Bachelor of Science in Nursing from Central Methodist University, later completing a Master of Science in Nursing from Maryville University.

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Trisha Anders, RN

Trisha graduated from Moberly Area Community College with an associate degree in Health Sciences and an Associate’s Degree in Nursing, and is currently studying at Central Methodist University for her Bachelor’s Degree in Nursing. She is a new mom and enjoys spending time with her family, traveling, taking her dogs on hikes, and reading in her free time. She brings 3 years of floor nursing experience and is passionate about improving her patient’s quality of life.

Bariatric Team


Vicki Duggan

Vicki is a Data Coordinator extraordinaire who brings over 30 years of experience to our program. She has an associate degree in Medical Sciences and is a Registered Radiologic Technologist. She takes great pride in her work. Which is why she has recently completed courses to obtain her Metabolic and Bariatric Clinical Reviewer Certification (MBSCR).


Austin Brawley

Austin is the Lead Patient Navigator in the Bariatric Program. He graduated from the University of Missouri with a Bachelor of Health Sciences in 2021 and is currently working towards his Master of Science in Healthcare Administration at the University of Michigan. Coming from a small town, he understands the difficulty for patients to navigate the healthcare industry. Austin is passionate about patient education and advocacy and will work with clinicians and support staff to create a painless patient journey through our Bariatric Program.


Michelle Osorio

Michelle is a Patient Navigator who brings her associate degrees in medical assisting and sonography together to help our patients achieve their long-term weight loss goals. Michelle began her patient service career working with individuals who were mentally and or physically challenged. She loved seeing the joy in her patient’s eyes when they accomplished their tasks and goals.

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Christy Powell

Christy is a Patient Access Representative ll. She has an associate degree in Business Administration and is a Columbia native. Christy knows firsthand the exciting journey of Bariatric Surgery. After having Gastric Bypass, herself she can attest to how life changing it is. Compassionate about our patients and continually striving to ensure the process is seamless. The road to a happy, healthier new you are within reach.

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Mackenzie Gareau

Mackenzie is currently getting a Health Science degree from the University of Missouri. After college she wants to pursue a career in the FBI as a Special Agent. She is a former D1 softball player and loves to go to sporting events and be active. Her goal is to provide her patients with the best care and to be their advocate throughout the process. She loves to see her patients go through the program and to see their hard work payoff.

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Kelsey Bennett

Kelsey is a Columbia native who joined Boone Hospital recently as a Patient Navigator and brings years of knowledge in the medical field to help patients check off their requirements to help them get Bariatric Surgery. She graduated from Bryan University with an Associates in Applied Science of Medical Assisting and has worked for years assisting patients in the office.