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Gastroenterology Associates of Colorado Springs has a team of experienced and professional gastroenterology providers who are essential in delivering high-quality digestive healthcare. Our providers possess a wealth of knowledge, education, and expertise in diagnosing and treating a wide range of gastrointestinal conditions. Patients can trust that our experienced gastroenterology providers will offer comprehensive care to address their unique needs and concerns.


Kendell Mann, MD

Dr. Mann was raised in Aiea, Hawaii. He earned his undergraduate degree in biochemistry at the University of Rochester in Rochester, New York. Prior to attending medical school, Dr. Mann spent one-year doing graduate research in the Department of Biochemistry at the University of Rochester in Rochester, New York. He returned home to attend medical school at the John A. Burns School of Medicine, the University of Hawaii at Manoa in Honolulu, Hawaii, on a military health profession scholarship.



University of Rochester 1986
John A. Burns School of Medicine, the University of Hawaii at Manoa 1992
Internship and Residency, Internal Medicine, Walter Reed Army Medical Center 1992-1995
Gastroenterology Fellowship, Walter Reed Army Medical Center 2002-2005


Board Certified

Diplomate of the Subspecialty of Gastroenterology/ABIM
Read Dr. Kendall Mann’s Healthgrades Reviews

Thomas-Meister- MD-Profile-Photo


Dr. Meister pursued his undergraduate degree at Creighton University, where he received a Bachelor of Science in Mathematics, before attending the University of Nebraska Medical School in Omaha. Dr. Meister completed his internship and residency training in internal medicine at Thomas Jefferson University Medical Center in Philadelphia, Pennsylvania. He completed one year of his subspecialty training in gastroenterology at Washington University-Barnes Hospital in St. Louis, Missouri, and the remainder at the University of Kentucky Medical Center in Lexington, Kentucky, where he received an academic appointment as an assistant professor of medicine.

Dr. Meister’s area of expertise includes disease of the liver and pancreas, inflammatory bowel disease, capsule endoscopy, endoscopic ultrasound, and advanced endoscopic procedures.


Creighton University, Omaha, NE 1987
Medical School: University of Nebraska School of Medicine 1991
Internship / Residency: Thomas Jefferson University Medical Center, Philadelphia, PA 1991-1994
Gastroenterology Fellowship: Washington University-Barnes Hospital, St. Louis, MO. 1994-1995
Gastroenterology Fellowship: the University of Kentucky Medical Center, Lexington, KY 1995-1996

Board Certifications

Diplomate of the American Board of Internal Medicine (ABIM)
Diplomate of the ABIM, Subspecialty of Gastroenterology
Read Dr. Thomas E. Meister’s Healthgrades Reviews




Elena Sidorenko, MD

Dr. Elena Sidorenko, a board-certified gastroenterologist, specializes in gastrointestinal diseases, with an emphasis on general digestive disorders, diarrhea, constipation, inflammatory bowel disease, gastroesophageal disease, diseases of the anorectal area, and gut dysmotility. She offers broad experience in endoscopic procedures with diagnostic and therapeutic implications.


Dr. Sidorenko relocated to Colorado Springs after working as an Associate Professor at Kansas University Medical Center for more than a decade. She completed the Gastroenterology and Hepatology Fellowship and Internal Medicine Residence Program at the University of Kansas, Kansas City. Dr. Sidorenko received her medical degree at Novosibirsk State Medical University and, after receiving additional training in tuberculosis and endoscopic procedures, practiced medicine in her hometown Novosibirsk at Tuberculosis Hospital and Regional Diagnostic Center. Dr. Sidorenko moved to the United States in 1994.


Due to Dr. Sidorenko’s experience in the field of gastrointestinal disease, she has contributed her professional knowledge to the medical community in numerous ways. Dr. Sidorenko has published and presented locally and nationally on the topics of esophageal diseases, including esophageal dysmotility disorders and Barrett’s esophagus, celiac disease, constipation, colorectal cancer, top gastrointestinal issues in women, and irritable bowel syndrome.

During her time at KU, Dr. Sidorenko was part of the GI Motility group performing research in the field of anorectal manometry and esophageal dysmotility disorders. She was active in education, teaching medical students, medicine residents, and GI fellows.

She is a member of the American College of Gastroenterology and the American Neurogastroenterology and Motility Society.

Getting to Know Dr. Sidorenko

Dr. Sidorenko enjoys spending her free time with her family and dogs doing fun things like hiking in the woods, traveling, and reading. She also enjoys gardening.

Board Certified

Diplomate of Gastroenterology since 2005 / ABIM
Read Dr. Sidorenko’s Healthgrades Reviews

Katie Hachuela Autoimmune Paleo Certified Coach Certificate of Completion

Katie Hachuela, NP

Katie Hachuela NP began her nursing career in 2008 where she worked in the Medical Surgical ICU in Kettering, Ohio until she moved to Colorado Springs in 2010. She then worked at the Ambulatory Surgery Unit at the Air Force Academy for four years until she completed her Family Nurse Practitioner degree at Regis University in Denver, Colorado, in 2015.  She joined our practice after her graduation and has since developed a passion for gastrointestinal health and believes, as did Hippocrates, that “All disease begins in the gut.”

She was introduced to Functional Medicine in 2018 and has attended many post-graduate trainings with the Institute of Functional Medicine through The Cleveland Clinic, The School of Applied Functional Medicine, and The Kalish Institute. She is thankful for her extensive GI knowledge as she believes it is the root cause of many of today’s chronic illnesses.

In 2020, while pregnant with her second child, she experienced her own gastrointestinal symptoms and was ultimately diagnosed with Small Intestinal Bacterial Overgrowth (SIBO) and Ulcerative Colitis (UC). She believes this, although ironic, was a gift for her to truly understand the agony patients can experience when their GI tract is malfunctioning. She is grateful for her Functional Medicine knowledge that has helped her heal her gut.

Katie has been married to Ian for 19 years, whom she met while serving in the United States Air Force. She is the mother of two beautiful daughters and enjoys being outdoors, hiking, biking, and practicing yoga.


Autoimmune Paleo Certified Coach – May 2024
The School of Applied Functional Medicine – present
The Kalish Institute – GI Module – 2019
Institute of Functional Medicine, Cleveland Clinic 2018
    Applying Functional Medicine in Clinical Practice
    GI Advanced Practice Module
    Environmental Health
Master of Science, Family Nurse Practitioner, Regis University,
Denver, CO, 2015

College: Bachelor of Science in Nursing, Wight State University,
Dayton, OH 2008



Certified Functional Nutrition Informed Professional October 2022
Family Nurse Practitioner May 2015
Registered Nurse June 2008
American Nurses Association
Colorado Nurses Association
Southern Colorado Advanced Practice Nurses Association
Read Katie Hachuela’s Healthgrades Reviews


Trish Sanford, ACNP

Trish Sanford, RN, MSN, ACNP-BC joined GACS in October 2012 as a GI Nurse Practitioner. She graduated with her AD-RN in 1982 from Boise State University. She then went on to get a BS in Biology with a minor in Chemistry from the University of Utah.

After working in ICU for ten years, she decided to get a second bachelor’s in Nursing from Delta State University, where she graduated Magna Cum Laude. She went directly into her Masters Degree Program at the University of Tennessee, graduating Magna Cum Laude as an Acute Care NP with a 4.0 GPA. During her Undergraduate Nursing School, she was inducted into the Sigma Theta Tau Honor Society of Nursing and has been a member since 1992.



Undergraduate Nursing, Boise State University 1982
BS: University of Utah 1982-1985
BSN: Delta State University 1994-1996
MSN, ACNP: University of Tennessee, HSC 1998-2001

Read Trish Sanford’s Healthgrades Reviews



Heather Winfield, fNP

Heather Winfield was born in Oklahoma but raised in Gunnison, Colorado. After graduating high school, she moved back to Oklahoma where she began working as a CNA and fell in love with medicine. She eventually went on to become a nurse and obtained her ADN through Rose State College and her BSN through Oklahoma University. She then achieved her goal of becoming a Nurse Practitioner by obtaining her FNP through Simmons University out of Boston Massachusetts. After graduation, she moved closer to home and began working as a provider through a GI group out on the Western Slope of Colorado and has been working in field ever since. 



Heather Genoshe NP GACS

Kathryn Genoshe, NP

Kathryn Genoshe, has lived in many places throughout her life since her father was in the United States Air Force. The family moved to Colorado Springs in 1967 and has lived here ever since, except for a short relocation to Houston for work. She completed her Bachelor of Science in Nursing at the University of Texas Health Science Center in Houston, graduating Summa Cum Laude. She received her Masters’ Degree Adult Nurse Practitioner from the University of Colorado. She spent many years at the bedside taking care of patients in the Intensive Care Unit and Cardiac Care Unit. She worked with the Hospitalist Team as a Case Manager prior to joining our practice in March 2008.

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