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GME Internal Medicine Faculty

Farrin-Manian-MD Farrin Manian, MD, MPH - Chairman

Dr. Manian received his M.D. degree from University of Missouri-Columbia in 1981. He completed his Internal Medicine residency and Infectious Diseases fellowship at Vanderbilt University Medical School in Nashville. In 2013, he joined the Department of Medicine at Mass General Hospital in Boston as a Clinician Educator. He served on the faculty of Harvard Medical School as Associate Professor of Medicine. In 2020, Dr. Manian joined the Department of Medicine at Mercy Hospital St. Louis as Chairman and Academic Hospitalist.

Nathan-Robertson Nathan Robertson, MD - Program Director

Dr. Robertson graduated from Saint Louis University School of Medicine in 2014. He completed his Internal Medicine residency at Saint Louis University in 2017 followed by a year as a chief resident. He joined Mercy in July of 2018 as an academic hospitalist.

Ivaturi-Pranati Pranati Ivaturi, MD - Associate Program Director

Dr. Ivaturi graduated from Government Medical College, Nagpur, India. She completed her Internal Medicine residency training at Mercy Hospital in 2002. She has been a practicing Hospitalist at Mercy for over 20 years. She is also passionate about teaching in both the Inpatient and Outpatient clinical settings. She is now a teaching attending in the Mercy JFK Clinic as well as an Academic Hospitalist.

Shirley Joo, MD - Associate Program Director Shirley Joo, MD - Associate Program Director

Dr. Joo graduated from Loyola Stritch School of Medicine and completed her internal medicine training, Chief Resident year and Allergy Immunology Fellowship training all at Washington University School of Medicine in Saint Louis.  She stayed on as faculty for the Division of Allergy Immunology as Associate Fellowship Program Director.  After leaving the program, Dr. Joo continued to care for patients at her private allergy practice in the community before deciding to return to teaching full time by joining the faculty at Mercy.  

Michelle-Kempf Michelle Kempf - Program Coordinator

Michelle Kempf joined the Internal Medicine Program in 2008 as the Program Coordinator. She earned her Bachelor’s Degree in Psychology from UMSL and her Master’s Degree in Business Management & Leadership from Webster University.

connor-shaw-do Connor Shaw, DO Chief Resident

Dr. Shaw received his D.O. degree from Kansas City University in Kansas City MO. He completed his Internal Medicine Residency training at Mercy Hospital St. Louis in 2024. He joined as Junior Faculty as Chief Resident for 2024-2025 and plans to pursue fellowship in Critical Care Medicine.

Core Faculty

Mark Bigg, DO Mark Bigg, DO

Dr. Bigg graduated from A.T. Still University Kirksville, MO in 2019.  He completed Internal Medicine residency at Mercy Hospital St. Louis in 2022 and joined Mercy St. Louis as an Adult Hospitalist.  In May 2024, Dr. Bigg joined Mercy St. Louis as an Academic Hospitalist to pursue his passion for teaching.

jen-bockerstett Jennifer Bockerstett, DO

Dr. Bockerstett attended medical school at A. T. Still University in Kirksville, MO. She completed internal medicine residency and a chief resident year here at Mercy Hospital St. Louis.  She is passionate about resident wellness, mentorship and teaching in both inpatient and outpatient settings. 

Katherine-Garland-MD Katherine L. Garland, MD

Dr. Garland received her medical degree from St. Louis University School of Medicine in 2006, completed her Internship at the University of Maryland and Residency and Chief Resident year at George Washington University in 2009.

Daniel Goering, MD Daniel Goering, MD

Dr. Goering graduated from Saint Louis University School of Medicine in 2021, he completed his Internship and Residency at the University of Iowa in 2024 and joined Mercy Hospital St. Louis as an Academic Hospital in July 2024.

1417036047-h Theresa Hughes, MD

Dr. Hughes is a St. Louis native who attended medical school at the University of Missouri Columbia and completed her Internal Medicine residency at Vanderbilt University. She has been a practicing hospitalist at Mercy for over 20 years with a passion for resident education and patient care in the inpatient setting. 

Rachel Keech, DO Rachel Keech, DO

Dr. Keech received her BS in Psychology from Washington University in St. Louis. She went on to earn her D.O. degree from Des Moines University. She joined the Mercy Hospitalists in 2008. During her time as a Mercy Hospitalist, she has been the Medical Director of multiple Mercy Hospitalists groups, Department Chair of Hospital Medicine, worked with the Hospital Care at Home program during its’ first year and is the East Region Physician Advisor to Utilization Management. Dr. Keech has transitioned full time to the Academic Hospitalist team as of 2024.

preston-mundhenke Preston Mundhenke, DO

Dr. Mundhenke attended medical school at Touro University College of Osteopathic Medicine in California.  He completed his Internal Medicine Residency training at Mercy Hospital St. Louis in 2023.  He is now a Core Faculty teaching attending in both Mercy JFK Clinic and as an Academic Hospitalist.

Academic Hospitalist

Mark Bigg, DO Mark Bigg, DO
jen-bockerstett Jennifer Bockerstett, DO
Daniel Goering, MD Daniel Goering, MD
1417036047-h Theresa Hughes, MD
Ivaturi-Pranati Pranati Ivaturi, MD
Rachel Keech, DO Rachel Keech, DO
Farrin-Manian-MD Farrin Manian, MD
preston-mundhenke Preston Mundhenke, DO
Nathan-Robertson Nathan Robertson, MD

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