Program Director

John C. Welch Jr., D.O., FACOFP, FAAFPJohn C. Welch Jr., D.O., FACOFP, FAAFP

Dr. Welch, a native resident of Upstate New York, graduated from the New York College of Osteopathic Medicine in Old Westbury, N.Y. He did his internship and residency at United Health Services in Johnson City, N.Y. Dr. Welch is board certified by the American College of Osteopathic Family Physicians. He has always desired a career that combined patient care with medical education and is very enthusiastic about training physicians in the Southern Tier. Dr. Welch started his role as the founding Family Medicine Program Director in 2014. In 2017, he became the Director of Medical Education and Designated Institutional Official and continues to foster academic and professional success of all learners in medical education. Dr. Welch also served as the Lourdes Nurse Practitioner Fellowship Program Medical Director 2013-2023 and is an active member of the Lourdes Provider Leadership Council. His medical interests are in HIV medicine and geriatrics but as a family physician he enjoys treating patients in all stages of life. Dr. Welch strongly believes in physician and caregiver wellness and his favorite well-being activities are gardening, fitness, music, and spending time with his family. 

Associate Program Directors

Lisa Newman, D.O.Lisa Newman, D.O.

Dr. Newman graduated from the New York College of Osteopathic Medicine and completed her residency at Mercy Suburban Hospital, Norristown, Pa. She is board certified in Family Medicine and OMM and is the Quality Director for the residency clinic.




Thomas Martin D.OThomas Martin D.O.

Dr. Martin graduated from the Philadelphia College of Osteopathic Medicine and completed his residency at United Health Services in Johnson City, N.Y. He is board certified by the American Board of Family Medicine. Dr. Martin served as the President of Lourdes Hospital Medical Staff from 2009-2011 and was the Professional Practice Committee Chairperson from 2011-2012. He the Director of Osteopathic Education and serves as the Medical Director for the residency clinic. 


Core Faculty

Susan Jackson, D.O.

Dr. Jackson graduated from University of Health Sciences, College of Osteopathic Medicine in Kansas City, Mo. She completed her residency at Medical Center of Independence in Independence, Mo. Dr. Jackson served as an Army physician for 7 years with a tour in Iraq. She is board certified in Family Medicine and OMM and her focus is on leading the Women's Health curriculum for our program. Dr. Jackson also serves as the Family Medicine Department Chairperson at Lourdes.

Ian Stuppel, D.O.Ian Stuppel, D.O.

Dr. Stuppel graduated from the University of Florida and completed medical school at Des Moines University. He completed family medicine residency training at Long Beach Medical Center, Long Beach, New York. He is board certified in Family Medicine and Osteopathic Manipulative Medicine. His Practice is located in Owego, New York.



John Leistner, M.D.John Leistner, M.D.

Dr. Leistner completed his medical school education at St. George's University. He completed his Family Medicine Residency at Our Lady of Lourdes Hospital in Binghamton, N.Y. and is board certified in Family Medicine. He serves as core faculty with the Lourdes Family Medicine Residency Program. He is passionate about medicine and caring for his patients and loves to teach the residents. Dr. Leistner's curricular focus includes board preparation and procedural training. 



Gary Dean, M.D.Gary Dean, M.D.

Dr. Dean completed his medical training at the SUNY Upstate Health Science Center and United Health Services. He has received several awards in teaching and has held faculty appointments with Upstate Medical University and SUNY Binghamton. Additionally, Dr. Dean has served on several community committees, including the Child Advocacy Center, and is a former department chairperson for Family Medicine at Lourdes. 



James DellaValle, M.D.

Dr. DellaValle graduated from the Medical College of Pennsylvania and completed his residency training at Abington Memorial Hospital. He also holds a MBA from Binghamton University. Dr. DellaValle has many years of teaching experience and has additional certifications in Medical Acupuncture and Point of Care Ultrasound. 

Chief Residents 

Peter Romoff, DO

I was born and raised in Rye, N.Y. My father is an OBGYN at Lenox Hill Hospital and my passion for medicine comes from him. Although the path to my career was long and at times wavering, I remained determined thanks to the love and support of my family. Originally I had pursued an IM residency, however with the birth of my first child, I had developed a passion for Family Medicine. I am very happy with my time and training here, and I am excited where I will be going to next. I hope that I have become a physician that everyone is proud of, and I will do my best to continue learning throughout my career. 

Bridgette Callaham, MD

I was born in Richmond, Va., but raised in Jersey City, N.J. I have always had a passion for helping people and medicine was the most effective way for me to do that. There were times when I was unsure, but after my daughter was diagnosed with Hirschsprung disease and had to undergo two surgeries, I was redirected back to medicine. However, it was a tough journey to get here being a single mom and attending medical school in the Caribbean. This long, tough journey has finally began to assure me that it was worth it. Although, I would be considered a non-traditional student, I have no regrets and am super proud of my accomplishments. I believe that my family, especially my daughter is proud of me, which makes everything worth it. I am beyond thrilled to begin my career as an outpatient family medicine physician where it all started, Richmond, Va. within the Bon Secours Hospital System (affiliated with St. Mary's Hospital) where my daughter had her surgeries. Everything has come full circle and seems to be destined. 

Program Coordinator

Mary Beth Bobik-Kadylak

Mary Beth is a life long resident of the Binghamton area and has worked in a variety of health care settings throughout her career. Her passion over the years has been in service to health care providers, patients and families in order for them to attain their highest level of care and understanding of their illnesses. She holds a Bachelors' Degree in Business with a focus in Human Resources and Associate Degrees in Health Information Technology and Liberal Arts. Mary Beth is Licensed Notary Public. She is dedicated to our residents and faculty and assists them in achieving their goals for the program. Outside of work, Mary Beth enjoys time spent with family and friends - especially her grandchildren; reading, gardening and floral design. Her efforts in the community have resulted in multiple awards from Sertoma and recognition from various not-for-profit organizations that she became affiliated with. Mary Beth is proud to call this community home.