Faculty & Fellows


Elisa Gumm, DO
Clinical Assistant Professor of Psychiatry
Addiction Medicine Fellowship Director
Shawn Platt, DO
Clinical Assistant Professor of Psychiatry
Addiction Medicine Fellowship Co-Director
Christina Arredondo, MD 
Clinical Assistant Professor
Jasleen Chhatwal, MD 
Assistant Professor of Psychiatry
Melody Glenn, MD, MFA
EMS Base Hospital Medical Director,
Assistant Professor
Brittany Pace, MD 
Clinical Associate Professor
Stephen Remolina, MD
Clinical Assistant Professor

Current Fellows

Justin Gause, MD

Justin was born in Louisville, KY, to a nomadic family that eventually settled in Boise, ID where he was raised. He studied biology and health sciences at Boise State University after working as a freelance musician, eventually graduating Magna Cum Laude and began medical training with the University of Washington School of Medicine with an interest in pursuing Family Medicine. His time in Seattle, WA further distilled his interest in working with medically underserved, rural, global, and marginalized communities particularly in supporting patients with complex socioeconomic backgrounds. This interest led him to his Family Medicine training with the University of Arizona South Campus Family Medicine program where his passion for addiction and substance use/abuse treatment further developed. During this time he had the opportunity to work at the Songabele rural health center in Nkololo, Tanzania where he coordinated the construction of a Neonatal Intensive Care Unit in an effort to improve neonatal mortality rates due to hypothermia, neonatal sepsis, and respiratory distress and plans to continue his work abroad. Justin continues to enjoy music during his personal time, and composed/recorded an original song “Goodnight” as a senior resident project and plans to compile an album of original songs in the near future. Justin also enjoys reading, philosophy, traveling, painting, cinema, and weight lifting.

Mark Grant, MD

Born in Phoenix, Arizona, Mark returned to the Southwest after completing medical school at Loyola Chicago. He completed his residency at the University of Arizona South Campus Family Medicine Program where he developed a passion for working with the underserved and homeless. Bilingual in Spanish, he also enjoys working with Spanish-speaking patients. Seeing the impact addiction had on patients in the Tucson community, Mark pursued a fellowship in addiction medicine to gain the skills that would help him better serve this population. When not working, Mark enjoys running, swimming, exploring the mountains around Tucson and being a father and husband.

Muhammad Qasim Maqbool, MBBS

Dr. Maqbool received his medical degree from King Edward Medical College, Pakistan in 2006. He completed his Family Medicine residency in 2013 from University of Oklahoma at Tulsa and received a Family Medicine award for Scholarship and the 2013 Resident Teacher Award. He had been working as a Hospitalist since completing his residency and served as a Faculty member for the University of Oklahoma Family Medicine program while also serving on the quality improvement committee. He enjoy hiking, table tennis, cricket, and soccer.