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Bariatric Physicians & Staff


Thomas Barnett, MD

  • Board Certified by the American Board of Surgery    
  • Residency at Lankenau Hospital
  • Advanced Degree fromGeorge Washington University School of Medicine
  • Internship at Salt Lake Research Foundation
  • Specialty is General Surgery

Rahul Singh, MD

  • Board Certified by the American Board of Surgery
  • Advanced Degree from Crimean State Medical University
  • Residency at North Shore University Hospital
  • Residency at University of Buffalo - SUNY
  • Fellowship at University of Missouri
  • Specialty is General Surgery, Bariatric Surgery, Minimally Access Surgery

Assar, Rather, MD

  • Board Certified by the American Board of Surgery
  • Advanced Degree from Government Medical College
  • Residency at Mercy Catholic Medical Center-Fitzgerald
  • Fellowship at the Cleveland Clinic Flordia
  • Specialties are Colorectal Surgery and General Surgery    


Patty Deer, RN, BSN, CNOR
Coordinator, Bariatric Program

Crystal Bouchard, RD, LDN
Registered Dietitian

Donna Hartzell, LPN
Bariatric Office Coordinator

The Bariatrics program also has on staff one clinical psychologist

Bayhealth is Southern Delaware’s healthcare leader with hospitals in Dover and in Milford. Bayhealth provides a wide range of medical services, including cardiovascular, cancer, orthopaedics and rehabilitation, pediatrics, respiratory care, sleep care, surgical weight loss, women’s services and walk-in medical care. Search for nursing jobs, and health classes and events. Find doctors affiliated with Bayhealth Medical Center or a Delaware hospital near you.