meet the Providers


Luciano A. DiMarco, D.O.

Dr. DiMarco is the proud founder of Central Pennsylvania Surgical Associates from a private practice in 1996. With a concentration in laparoscopic technique, he performed the first laparoscopic gastric bypass surgery at Community General Hospital in Harrisburg. With a strong interest in treating the growing problem of morbid obesity via laparoscopic surgery, Dr. DiMarco began the bariatric surgery program at Community General Hospital. He is dedicated to excellence in bariatric surgery as well as general surgery procedures.
Luciano A — Meet The Providers in Harrisburg, PA

Justin Rosenberger, D — Meet The Providers in Harrisburg, PA

Justin Rosenberger, D.O.

Dr. Rosenberger completed his undergraduate training at Allegheny College in Meadville, PA. He went on to gain his degree in medicine at Philadelphia College of Osteopathic Medicine and his general surgery residency and bariatric surgery training at Pinnacle Health. He practices as a general and bariatric surgeon at Pinnacle Health in Harrisburg and also has an interest in minimally-invasive surgery. Dr. Rosenberger is also proudly involved with the training of the general surgery residents at Pinnacle Health.
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Jeffrey M. Small, D.O.

Dr. Small gained his undergraduate degree in microbiology and genetics from North Carolina State University. He attended the West Virginia School of Osteopathic Medicine and completed his internship at Pinnacle Health in Harrisburg. Dr. Small practices and primarily sees patients at the Hagerstown, MD location, and performs surgery at Meritus Health.
Dr. Jeffrey Small — Meet The Providers in Harrisburg, PA

Robert Carman, D — Meet The Providers in Harrisburg, PA

Robert Carman, D.O.

Dr. Carman is a Board Certified general surgeon who is fellowship trained in minimally-invasive colon & rectal surgery at the University of Texas. He obtained his degree in osteopathic medicine from the Philadelphia College of Osteopathic Medicine and completed his internship and general surgery residence at Pinnacle Health in Harrisburg, PA.

Dr. Carmen's fellowship concentration was laparoscopic techniques including robotics for colon and rectal surgery. In addition, he is trained in conditions affecting the anus and the rectum including fissures, fistulas, abscesses, hemorrhoids, prolapse, and incontinence. He is very proud to be affiliated with Pinnacle Health and is committed to providing patients in the region with the very best in surgical care.


Dr. Karel Keiter, D.O.

Karel Keiter, DO, provides medical management care for overweight patients seeking treatment. Dr. Keiter and the onsite dietitian work collaboratively to customize a weight loss program for the patient. Dr. Keiter received her Doctorate of Osteopathic Medicine at Philadelphia College of Osteopathic Medicine. She is board certified in family medicine and most recently practiced family medicine at Penn State Milton S. Hershey Medical Center. Dr. Keiter completed certification to become a Diplomate within the American Board of Obesity Medicine.

Dr. Keiter maintains a number of professional affiliations including:
  • American Osteopathic Association
  • Pennsylvania Osteopathic Medical Association
  • American College of Osteopathic Family Physicians
  • Pennsylvania Osteopathic Family Practice Society
  • Obesity Action Coalition
  • American Society of Bariatic Physicians
Dr. Karel K — Meet The Providers in Harrisburg, PA
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Lindsey Bowman, PA-C, MHS

Lindsey Bowman is a Board Certified Physician Assistant and holds professional memberships in the American Academy of Physician Assistants, Pennsylvania Society of Physician Assistants, and the American Association of Surgical Physician Assistants. Originally from Mechanicsburg, Pennsylvania, Linsdsey joined Central Pennsylvania Surgical Associates in 2012. She gained her Bachelors of Health Science from Lock Haven University and went on to gain her Master's from Lock Haven University's Physician Assistant Program in 2009.

Lindsey is dedicated to providing excellent patient care. She works closely with the bariatric surgeons, assisting in the operating room as well as focusing on outpatient bariatric care.
Lindsey Bowman, PA-C, MHS — Meet The Providers in Harrisburg, PA

Justin Rosenberger, D — Meet The Providers in Harrisburg, PA

Loretta Harvey

Loretta Harvey is a Board Certified Physician Assistant. She obtained her undergraduate degree in Nutritional Sciences from Penn State University in 2002 and completed her dietetic internship with Aramark Healthcare Services in 2004. She began her professional career as a clinical dietitian working in nutrition support, weight loss and therapeutic diet interventions. She went on to obtain her Master’s in Physician Assistant Studies from Penn State University’s Physician Assistant Program in 2016.

Loretta is committed to providing exceptional patient care working closely with the bariatric surgeons in both the operating room and in the outpatient setting.

Our Registered Dietitians

  • Sara Meloy, RD, LDN
  • Kalie Esper, RD, LDN