Resources
Meet the Faculty
Delilah Easom, MD - Program Director
Dr. Easom is the inaugural Program Director for the Mercy Fort Smith Internal Medicine Residency Program. She earned her Doctor of Medicine from the University of Arkansas for Medical Sciences, where she also completed her Internal Medicine residency. She is certified by the American Board of Internal Medicine and is a Certified Wound Care Specialist-Physician by the American Board of Wound Management.
Dr. Easom has worked at Mercy for more than 20 years, serving in multiple leadership roles, including Medical Director of the Mercy Hospitalists Group from 2004 to 2015. In addition to her administrative responsibilities, she serves as an attending physician in the continuity clinic and occasionally on the inpatient service. Dr. Easom also serves as Clinical Adjunct Faculty at the Arkansas College of Osteopathic Medicine. Outside of medicine, she enjoys cooking.
Amita Heaser, MD - Associate Program Director
Dr. Heaser earned her Doctor of Medicine from Rosalind Franklin University School of Medicine in North Chicago, IL, and completed her Internal Medicine residency at Rush University Medical Center in Chicago. She serves as Medical Director for the Internal Medicine Continuity Clinic and maintains a busy outpatient Internal Medicine practice at Mercy Clinic, with a special interest in geriatric medicine.
Dr. Heaser holds an appointment as Clinical Adjunct Faculty at the Arkansas College of Osteopathic Medicine, where she precepts third- and fourth-year medical students. She enjoys hiking and traveling, including missionary trips where she has provided medical care in Honduras. She is fluent in Bengali and has moderate fluency in Spanish.
Kevin Davis, MD – Core Faculty, Sub-Specialty Education Coordinator
Dr. Davis earned his Doctor of Medicine degree from the University of Arkansas for Medical Sciences, where he also completed a residency in Internal Medicine/Pediatrics and a fellowship in Infectious Diseases. He is board-certified by the American Board of Internal Medicine and subspecialty-certified in Infectious Disease.
As Associate Program Director, Dr. Davis oversees the didactic content and schedule, ensuring residents receive a comprehensive and well-structured educational experience. In 2024, he received the inaugural Internal Medicine Residency Educational Innovation Award. Dr. Davis also serves as the Infectious Disease Medical Director for Mercy Fort Smith and as Clinical Adjunct Faculty at the Arkansas College of Osteopathic Medicine.
Melissa Kuehl, DO - Core Faculty
Dr. Kuehl earned her Doctor of Osteopathic Medicine from Kirksville College of Osteopathic Medicine/A.T. Still and completed her Internal Medicine residency at Freeman Health System. She is board-certified by the American Osteopathic Board of Internal Medicine.
Dr. Kuehl is a hospitalist at Mercy Hospital and serves as Core Faculty for the residency program. In addition to supervising residents during their Night Float rotations, she serves as a mentor and facilitates weekly Board prep sessions. Dr. Kuehl also serves as Clinical Adjunct Faculty at the Arkansas College of Osteopathic Medicine
Scott O’Hern, DO - Core Faculty
Dr. O’Hern graduated from Texas A&M University and earned his Doctor of Osteopathic Medicine from the University of North Texas Health Science Center – Texas College of Osteopathic Medicine in Fort Worth, Texas. He completed his Internal Medicine residency at the University of Texas Health Northeast/Christus Good Shepherd Medical Center.
Dr. O’Hern serves as the Medical Director for the Mercy Fort Smith Hospitalist Group. Dr. O’Hern has a strong interest in patient safety and quality of care, serving on both the Mercy Hospital Controlled Substance Stewardship Team and the PEAT Committee. He enjoys the variety that teaching residents adds to his day and finds it especially rewarding to see interns grow into confident senior residents ready for independent practice. Dr. O'Hern also serves as Clinical Adjunct Faculty at the Arkansas College of Osteopathic Medicine. Outside of medicine, he enjoys time with his wife and two children. A fun fact about Dr. O’Hern: he met his wife swing dancing and even competed in swing dance competitions during college.
Connor Eli Rayburn, MD
Dr. Rayburn earned his Doctor of Medicine degree from the University of Arkansas for Medical Sciences, where he also completed his residency training in Internal Medicine. He is certified by the American Board of Internal Medicine and is a hospitalist at Mercy Hospital Fort Smith.
In 2025, Dr. Rayburn received the Internal Medicine Residency Educational Innovation Award for his creative approaches to teaching and learner engagement. He also serves as Clinical Adjunct Faculty at the Arkansas College of Osteopathic Medicine. Outside of medicine, Dr. Rayburn enjoys golfing, playing guitar, spending time with his wife and children and cheering on the Razorbacks. A fun fact about Dr. Rayburn: during his undergraduate years, he advanced through the first round of producer cuts for the television show The Voice.
Mohankumar Doraiswamy, MD
Zachary Ray, MD – Core Faculty
Dr. Ray earned his Doctor of Medicine from the University of Arkansas for Medical Sciences, where he also completed his Internal Medicine residency. He is a hospitalist at Mercy Hospital Fort Smith and serves as Core Faculty for the residency program.
Dr. Ray has a passion for critical thinking and problem-solving, viewing each patient as a unique puzzle with an individualized solution. He especially values the depth and breadth of Internal Medicine and the challenge of optimizing care for each patient. He enjoys working with residents and finds it rewarding to watch them grow from reporters into confident attendings over the course of their training. In 2025, he received the Outstanding Teaching Excellence Award in recognition of his contributions to resident education. Dr. Ray also serves as Clinical Adjunct Faculty at the Arkansas College of Osteopathic Medicine. Outside of medicine, he spends most of his time with his family. Together, they enjoy board games, rock climbing—both indoor and outdoor—and exploring the outdoors, including summiting a couple of Colorado’s 14ers.
