Your Doctors

Our Providers are Members of:

  • American Academy of Physician Assistants (AAPA)
  • American Association of Tissue Banking
  • American College of Physicians
  • American Medical Association
  • American Society for Microbiology
  • Infectious Diseases Society of America
  • Infectious Diseases Society of New Jersey
  • New Jersey State Society of Physician Assistants
  • Society for Healthcare Epidemiology of America

Our Hospital Affiliations Include:

  • Saint Barnabas Medical Center
  • Morristown Medical Center
  • Hackettstown Regional Medical Center
  • Kessler Institute for Rehabilitation
  • Saint Clare’s Hospital in Denville
  • Saint Clare’s Hospital in Dover

We have been featured in:

  • Castle Connolly
  • Inside Jersey
  • Millburn and Short Hills Magazine
  • New Jersey Monthly (Top Docs for 6 years!)
  • New York Magazine

Manal Youssef-Bessler, MD

Manal Youssef-Bessler, MD, the founder of the Infectious Disease Center of New Jersey, attended Cairo University Faculty of Medicine in Cairo, Egypt. She completed her Internal Medicine Residency and Infectious Diseases Fellowship at the University of Medicine and Dentistry- New Jersey Medical School. Dr. Bessler is Board certified in Internal Medicine and Infectious Diseases. She is a member of the Infectious Disease Society of America, Infectious Disease Society of New Jersey, American Medical Association and the American College of Physicians.

Dr. Bessler has received several honors and awards including the Saint Barnabas Medical Center Physician Excellence in Healthcare award and Most Outstanding Subspecialist of the Year as well as patient choice awards in several consecutive years. In addition she has received nominations as a Top Infectious Diseases Doctor from  Castle Connolly, NJ Monthly, Inside Jersey and New York Magazine for many consecutive years.

Dr. Bessler is affiliated with the Wound and Burn Healing Center at Saint Barnabas Medical Center and the Wound Healing Center at Hackettstown Regional Medical Center.

Her areas of interest include management of severe sepsis and septic shock, diagnosis and management of fever of unknown origin, pulmonary and intra-abdominal infections, diabetic wound infections and diabetic wounds management, tick born diseases, HIV care, Hepatitis B infection and Infection Control.

Janet Lin-Torre, MD

Janet Lin-Torre, M.D. attended Johns Hopkins University and NY Medical College. She completed an Internal Medicine and Infectious Diseases fellowship, at Mount Sinai Medical Center in NY and is board certified in Internal Medicine and Infectious Diseases. Dr. Lin-Torre served as Chief of Infectious Diseases and Hospital Epidemiologist at Muhlenberg Regional Medical Center.

She is currently an attending physician at Saint Barnabas Medical Center, Associate Medical Director at Musculoskeletal Transplant Foundation and Hospital Epidemiologist at Summit Oaks Hospital. She is a Clinical Associate Professor of Medicine at Rutgers Robert Wood Johnson Medical School. In addition, Dr. Lin-Torre is a Fellow of the American College of Physicians, Fellow of the Infectious Diseases Society of America and a member of Alpha Omega Alpha, NJ Infectious Diseases Society, Society for Healthcare Epidemiology of America, American Society for Microbiology and American Association of Tissue Banking.

Dr Lin-Torre serves on the Board of Health for Millburn, NJ and is a member of the Gender Disparities in ID Task Force for the Infectious Diseases Society of America. In addition, she is an alumni interviewer for Johns Hopkins University. Her professional interests include infection control, antibiotic monitoring and nosocomial infections.

Marjut Kokkola-Korpela, MD

Dr. Marjut Kokkola-Korpela is a native of Finland, where she finished her Medical School in the University of Kuopio. After moving to the United States, she completed her internal medicine training at Mercy Hospital in Pittsburgh,PA.

Dr. Kokkola-Korpela completed her infectious disease training at the combined program of the University of Chicago and University of Illinois in Chicago. Dr. Kokkola-Korpela received extended training in HIV and research at Seton Hall University Infectious Disease program rotating at St Michael's Medical Center, St. Joseph's Regional Medical Center and JFK Medical Center. Dr. Kokkola-Korpela is currently an attending physician at St. Barnabas Medical Center in Livingston, St Clare Hospital, and Hackettstown Regional Medical Center. Her professional areas of interest include wound care, tropical diseases, HIV/AIDS, and women's health.

Karyna M. Neyra, M.D.

Medical School: Universidad Nacional Mayor de San Marcos. Lima, Peru.
Residency: Hackensack University Medical Center at Mountanside, Montclair, NJ
Fellowship: Cleveland Clinic. Cleveland, OH.

Qualifications :
- Received specialized training in transplant Infectious Diseases including all solid organ transplantation and bone marrow transplant at Cleveland Clinic
- Tropical medicine training in Research Institute of Tropical Medicine in Manila, Philippines.
- Fluent Spanish speaker

Infectious Disease Society of America
American College of Physicians
American Transplant Society
Society for Healthcare Epidemiology of America (SHEA)

- Chief Resident 2015-2016.
- Presented cases in American College of Chest Physicians 2015 (Chlamydia pneumonia as a cause of cryptogenic organizing pneumonia) and American Neurology Academy / American College of Physicians 2016 (neurosyphilis presenting as myelopathy).
- Travel grant for research on Antifungal Prohylaxis in liver transplant recipients at Infectious Disease society 2017.
- Presenting at American Transplant Congress 2018: use of Colistin in solid organ transplant recipients.

Interests: Antimicrobial resistance, hospital-acquired infections, fungal infections, mycobacterial infections and transplant-related infections.

Michael A. Gelman, MD, PhD

Michael A. Gelman, MD, PhD, attended the University of Wisconsin-Madison. He completed his internal medicine residency at the University of Washington in Seattle and his Infectious Diseases fellowship at Stanford University. Dr. Gelman is board certified in Internal Medicine and Infectious Diseases. He is affiliated with the James J. Peters Veterans Affairs Medical Center (Bronx, NY), where he is the Medical Director of the Infection Control Program and of the Antimicrobial Stewardship Program. He also holds an assistant professorship in the Department of Medicine at the Icahn Mount Sinai School of Medicine (New York, NY).

Dr. Gelman's areas of interest, in addition to antimicrobial stewardship and infection control, include the treatment of HIV, Hepatitis C, and diabetic foot osteomyelitis; he is an investigator on clinical trials in all of the preceding areas. He is also interested in readiness for and response to special pathogens such as Ebola and avian influenza.

Jacqueline Stimmel, MHS, PA-C

Jacqueline Stimmel, MHS, PA-C attended Quinnipiac University in Hamden, CT where she graduated summa cum laude with a Bachelor of Science in Health Science Studies from the university honors program. She also completed her Masters of Health Science- Physician Assistant degree at Quinnipiac University, where she graduated at the top of her class and was the recipient of the Academic Excellence Award presented to the student that excelled in both the didactic and clinical phases of post-graduate education.Jacqueline has also been inducted into Pi Alpha, the National Honor Society for Physician Assistants that recognizes PAs who exemplify leadership, research, service to the community, strength of character and significant academic achievement.

She is board certified by the National Commission on Certification of Physician Assistants. She is also a fellow of the American Academy of Physician Assistants (AAPA), and has presented at the national AAPA conference.

Brittany Spiegel, NP-C

Brittany Spiegel, NP-C joined the Infectious Disease Center of New Jersey after spending 5 years as a Registered Nurse. She earned her undergraduate degree cum laude with Distinction from Ramapo College of New Jersey in 2012 and her Master’s Degree from Felician University in 2016. Her degree as a Family Nurse Practitioner means she is trained and certified in the care of individuals across the lifespan, infant through adult. She is a member of Sigma Theta Tau, the Honor Society of Nursing, since 2012. Before joining the Infectious Disease Center of New Jersey, Brittany worked at Saint Barnabas Medical Center as a nurse and coordinator with the renal transplant and dialysis-dependent population. She is board certified by the American Academy of Nurse Practitioners.

Beyyinah Hasan, APN

Beyyinah Hasan, FNP-BC recently joined the Infectious Disease Center of New Jersey, from a background in the urgent care setting and has 12 years of experience as a Critical Care Registered Nurse. She holds undergraduate degrees from Rutgers University and South University of which she graduated with honors as Cum Laude. In 2012 she was inducted into the Sigma Theta Tau National Honor Society of Nursing, which recognizes the top 10 percent of graduating nurses. Her continued hard work was acknowledged by Walden University where she graduated in 2014 with a 3.9 GPA with a Master's Degree as a Family Nurse Practitioner. Furthermore, Beyyinah will be starting her Doctorate of Nursing Practice program in the fall of 2018. She is board certified by the American Nurses Credentialing Center.


For more information about Infectious Disease Center of New Jersey Please Call:



568 Route 10
Whippany, NJ 07981

Phone: 973-535-8355
Fax: 973-535-8353