Our Providers
Gastroenterologists
Scott Plaehn, DO, FACOI
Dr. Plaehn is a medical graduate from the Chicago College of Osteopathic Medicine in Illinois. He performed his Internship and Residency at Metropolitan Hospital in Grand Rapids, Michigan an affiliate of Michigan State University. He then went on to Botsford General Hospital in Farmington Hills, Michigan where he completed his Fellowship in Gastroenterology. Dr. Plaehn is board certified in both Internal Medicine and Gastroenterology. He has been practicing in the Lansing area since 1996.
Albert Ross, MD
Dr. Ross received his medical degree from Washington University in St. Louis, Missouri where he graduated with honors. His Internship and Residency were performed at the University of Chicago Hospital and his Fellowship was completed at Froedtert Memorial Lutheran Hospital in Milwaukee, Wisconsin. He is board certified in both Internal Medicine and Gastroenterology. Dr. Ross has been practicing in the Lansing area since 1995.
Dorian Jones, MD
Dr. Dorian Jones was born in Detroit, Michigan, and grew up in Romulus and Canton, Michigan. From an early age, he had a passion for science and helping others. He graduated from Plymouth Salem High School with distinction. He received a Bachelor of Arts in Chemistry from Kalamazoo College in Kalamazoo, Michigan. He also completed a minor in Biology with concentrations in molecular biology and biochemistry. His senior thesis was in synthetic organic chemistry. During his time at Kalamazoo College, he studied abroad in Madrid, Spain, and served on many committees. Afterward, he received his Doctor of Medicine (M.D.) from Tufts University School of Medicine in Boston, Massachusetts. Next, he completed internal medicine training at the Cleveland Clinic Foundation in Cleveland, Ohio, and served an additional year as a Chief Medical Resident. During this time, he completed training in process improvement, and participated in training in Lean and Six Sigma. He completed Gastroenterology and Hepatology Fellowship at Henry Ford Hospital in Detroit, Michigan. During training, he researched and published in inflammatory bowel disease, process improvement, patient safety, and liver disease. Later, he moved to Okemos with his wife and daughter, and joined the Digestive Health Institute. Since his arrival in 2018 he has enjoyed seeing patients in Gastroenterology and Hepatology, and servicing the community. In addition to his work in medicine and research, he enjoys sports, running, weightlifting, photography, reading, and cooking.
Jannel Lee-Allen, MD
Tadd Hiatt, MD
Matthew J. DiMagno, MD, AGAF
Physician Assistants
Jonathan Thelen, PA-C
Jonathan Thelen PA-C obtained his Bachelor of Science Degree in human biology with a specialization in health promotion from Michigan State University in May 2007. He then attended Central Michigan University and graduated with a Master’s Degree and Certification in Physician Assistant Studies in July 2009. He has been with Digestive Health Institute since 2009. He also holds the position of the Mid-Level Provider Coordinator.
Callie Hart, PA-C
Callie received her Bachelor of Arts in Human biology with high honors from the University of Michigan. She completed her graduate studies at Central Michigan University, earning her Masters in Science- Physician Assistant Studies in October 2020. Callie joined the Digestive Health Institute team in August 2021.
Brooke Janke, PA-C
Brooke Janke, PA-C obtained her undergraduate degree with a major in biomedical sciences from Central Michigan University in 2014. She earned her Master of Physician Assistant Studies from Grand Valley State University in 2017. She is board certified with the National Commission on Certification of Physician Assistants and joined the Digestive Health Institute team in 2018.
Andrea Koerner, RD, PA-C
Andrea Koerner PA-C obtained her Bachelor of Science Degree in Dietetics from Central Michigan University. She then completed the University of Michigan Health System Dietetic Internship which enabled her to become a Registered Dietitian. She then attended Eastern Michigan University and graduated with a Master’s Degree and Certification in Physician Assistant Studies in July 2019. She has been with Digestive Health Institute since 2021.
Don Laird, PA-C
Don Laird PA-C achieved his Bachelor of Science Degree in human biology from Michigan State University in May 2007. He continued his graduate studies at Central Michigan University and earned his Masters degree and Certification in Physician Assistant Studies in July 2009. He has been with Digestive Health Institute since 2009.
Scott Zeilstra, PA-C
Scott Zeilstra PA-C achieved his Master’s Degree from Central Michigan University Physician Assisting Program and joined Digestive Health Institute after graduation in 2013. He is certified by the National Commission on Certification of Physician Assistants.
Leslie Thelen, PA-C
Scott Zeilstra PA-C achieved his Master’s Degree from Central Michigan University Physician Assisting Program and joined Digestive Health Institute after graduation in 2013. He is certified by the National Commission on Certification of Physician Assistants.
