Our Team


Stephen G. Diamantoni, M.D.

Dr. Diamantoni is a graduate of Lehigh University and Hahnemann Medical College. He completed his residency training in Family Practice at Lancaster General Hospital in 1985, where he served as Chief Resident. Dr Diamantoni is board certified in Family Practice and has also earned Board Certification in Geriatrics and Sports Medicine. He is Board Certified by the American Board of Medicolegal Death Investigators. He is a Fellow of the American Academy of Family Practice. Dr Diamantoni founded Diamantoni and Associates in 1985 and is the Managing Partner. He is the elected Coroner of Lancaster County. He lives in Manheim Township with his 3 children. He enjoys skiing, scuba diving, and coaching soccer.

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Howard J. Gerstein, M.D.

Dr. Howard Gerstein has been a Pennsylvania boy all his life, graduating from Hazelton High School, Muhlenberg College and Pennsylvania State Medical School. He served in the Navy for seven years, including tours in Argentina, Newfoundland Canada, and in Cherry Point, NC. Dr. Gerstein performed his internship and family practice residency while with the Navy in Charleston, SC.

Dr. Gerstein was initially board certified in Family Practice in 1989 and joined Diamantoni & Associates in 1990. He has hospital privileges at Lancaster Regional Medical Center as well as at Lancaster General Hospital where he was Chairman of the Department of Family Practice from 2009 through 2011.

Dr. Gerstein enjoys studying the Bible and riding his bicycle with the Lancaster Bicycle Club. He considers himself a “car guy/gear head” having raced cars for 17 years. A proud grandfather, he hopes his two-year old grandson, Eli, will drive his 1956 hot-rod Chevrolet station wagon when he gets his driver’s license.

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Gail F. Bodner, M.D.

Dr. Gail Bodner graduated from Rutgers University with a Bachelor of Science degree in Biochemistry. She received her medical degree from Hahnemann University in Philadelphia and completed her Family Medicine internship at Eastern Virginia Medical School. Dr. Bodner performed her Family Medicine residency at Moses Cone Memorial Hospital in North Carolina.

After working in emergency medicine at Winona Memorial Hospital in Indianapolis, IN Dr. Bodner continued in this field at both Lancaster General Hospital and Reading Hospital and Medical Center. Dr. Bodner joined Diamantoni and Associates in 1989 and is a member of the American Academy of Family Physicians and the Pennsylvania Medical Society. She enjoys treating patients of all ages and considers it a privilege to work with patients and their families.

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Adrian F. Hazbun, M.D.

Dr. Adrian Hazbun attended Yale University where he received a double Bachelor of Science degree in molecular biophysics, biochemistry, and organismal biology. He attended Temple University School of Medicine and graduated in 2002. Dr. Hazbun performed his Family Medicine internship and Family Medicine residency at Ventura County Medical Center in Ventura, California, graduating in 2005.

After travelling to Botswana, Uganda, and Tanzania where he treated children suffering from HIV/AIDS, Dr. Hazbun joined Diamantoni & Associates team in 2008. He is certified by the American Board of Family Medicine and his interests include playing soccer and traveling overseas.

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Elizabeth Maxwell, MD

Diamantoni and Associates takes great pleasure to announce that Dr. Elizabeth Maxwell is joining our team of providers. Dr. Maxwell comes from a very diversified background and is eager to begin her career in medicine with us.  She provides a great blend of top-notch clinical education and knowledge with a passion for providing community based care.

Dr. Maxwell attended Ohio State University College of Medicine and her residency with Lancaster General hospital Family and Community Medicine. She brings her outstanding record of philanthropy and service to the Lancaster community. Dr. Maxwell, as a primary care provider, will be providing the community with comprehensive healthcare services as well as Obstetric Care.

She is fluent in Spanish

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Maria F. Perlis, M.D.

Dr. Maria Perlis was born and raised in Schenectady, NY. She attended Cornell University for her undergraduate studies, receiving her degree in 1990. Dr. Perlis earned her medical degree in 1994 from the State University of New York Health Science Center. She performed her residency at Lancaster General Hospital from 1994-1997 and joined Diamantoni & Associates in August of 1997.

Dr. Perlis has been board certified by the American Board of Family Medicine since 1997, and is currently certified through 2023. Professional memberships include: the American Academy of Family Physicians, the Pennsylvania Academy of Family Physicians, and the Christian Medical and Dental Associates.

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Jeffrey T. Trost, M.D.

Dr. Jeffrey Trost attended the University of Scranton and received a Bachelor of Science in Biology before attending Temple University for his Doctor of Medicine degree. He completed his residency at Lancaster General Hospital and joined Diamantoni & Associates in 1994.

Dr. Trost enjoys caring for patients of all ages. He feels it is an honor to be a part of so many peoples’ lives and hopes to assist them in their journey.

Dr. Trost has retired from rugby, but still enjoys hockey, skiing and kayaking, making his yard look half-decent, and going to the beach with his wife and dogs.

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Physician Assistants

James Bounds, PA-C

After graduating from Conestoga Valley High School, James Bounds went to the University of Richmond where he earned his Bachelor of Science and Bachelor of Arts degrees in 2001. After spending time working and playing in Key West, FL and Portland, OR, James completed his Master of Health Sciences in Physician Assistant Studies at Lock Haven University of Pennsylvania in 2006. He is certified by the National Commission of Certification of Physician Assistants.

James and his wife have three children who are the focus and joy of their lives. If not at home with the kids, you will most likely find James enjoying the outdoors on his skis, bicycle, or with golf clubs or a flying fishing rod in hand.

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David Gilmore, PA-C

David Gilmore is a 2017 graduate of Arcadia University where he received his Master of Medical Sciences in Physician Assistant Studies degree. David completed his undergraduate studies in 2014 at Gettysburg College where he received a Bachelor of Arts in Health Sciences.  He is accredited by the National Commission on Certification of Physician Assistants and is a member of the American Academy of Physician Assistants and Pennsylvania Society of Physician Assistants.

David grew up in Avon, CT and is an avid New England Patriots fan. He enjoys golfing and has two dogs back home with his family in Connecticut.

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Bethany King, PA-C

Bethany King is a graduate of Philadelphia University where she earned her Master of Medical Science in Physician Assistant Studies. Beth completed her undergraduate studies in Health Sciences, also at Philadelphia University. In addition to family medicine, she has a particular interest in women’s health and preventive medicine. She is accredited by the National Commission on Certification of Physician Assistants and is a member of the American Academy of Physician Assistants and the Pennsylvania Society of Physician Assistants.

In her free time, Beth and her husband enjoy kayaking, hiking, and spending time with their dog Sadie.

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Michael C. Shipman, PA-C

Michael Shipman earned his Bachelor of Science degree at Rutgers University. He attended the College of Medicine and Dentistry of New Jersey and received his Certificate of Training as a Physician’s Assistant. Michael earned his certification of training as a Medical Services Specialist and Medical Services Technician at the U.S. Air Force School of Health Sciences. Michael joined Diamantoni & Associates in 2008.

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Daniel D’Elia, D.O.

Daniel D’ Elia was born in Philadelphia, PA but claims Lancaster as his home since he has lived here for 31 years. He graduated from Hope College in Holland, MI in 1977, then from Pennsylvania College of Optometry in 1982. Dr. D’ Elia is a member of Beta Sigma Kappa, the International Optometric Honor Society, and joined Diamantoni and Associates in 1999. In addition to his busy practice at Diamantoni and Associates, Dr. D’Elia also takes care of Alzheimer’s patients at Conestoga View.

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