Concord Hospital Medical Group Welcomes New Internal Medicine Providers
Concord Hospital Medical Group is pleased to announce that William Logan, MD, and Ramon Hendrik Guillen, MD, have joined the medical staff at Concord Hospital Internal Medicine – Laconia.
Dr. William Logan is board-certified in internal medicine, geriatric medicine, and hospice and palliative medicine by the American Board of Internal Medicine. He earned his medical degree from the University of North Carolina at Chapel Hill School of Medicine (1992) and completed residency training in both surgery at the Mayo Clinic (1992–1995) and internal medicine at UNC Hospitals (1995–1998). He later completed a fellowship in geriatrics at Duke University (2004–2006). In addition to his clinical work, Dr. Logan holds an advanced business degree from the University of Tennessee, Haslam School of Business (2020).
Dr. Ramon Hendrik Guillen completed his internal medicine residency at Mount Auburn Hospital in Cambridge, Massachusetts (2025) and serves as a clinical fellow at Harvard Medical School, teaching medical students during their rotations. He received his medical degree from TU Dresden Medical School in Germany, with a visiting student experience at University College London. Dr. Guillen has been active in cardiology research at Beth Israel Deaconess Medical Center and has authored multiple peer-reviewed publications in cardiovascular medicine. Fluent in English, German, and Spanish, he brings international training and a commitment to academic medicine to his new role in the Lakes Region.
“Welcoming Dr. Logan and Dr. Guillen expands our ability to provide compassionate, high-quality primary care to the Lakes Region,” said CHMG Chief Administrative Officer and CH Vice President of Operations Bill Dooley. “Their combined expertise in geriatrics, internal medicine, and academic medicine will help us meet the growing needs of our community.”
Concord Hospital Health System (CHHS) is a nationally accredited, not-for-profit health system delivering comprehensive acute-care services and programs to more than 250,000 residents across New Hampshire. CHHS encompasses the Payson Center for Cancer Care, Urologic Institute, Orthopaedic Institute, Cardiovascular Institute, The Family Place; hospitals in Concord, Franklin, and Laconia, NH; and over 60 locations offering ambulatory and specialty services throughout the state.
CHHS has earned national recognition, including being named to Forbes’ list of America’s Best Midsize Employers and Best-In-State Employers, Newsweek’s America’s Best Maternity Hospitals, and the Lown Institute’s Most Socially Responsible Hospitals.
As a teaching organization, CHHS provides specialty training in medical, clinical, and nursing through apprenticeships, rotations, and residencies. With nearly 5,000 employees, CHHS is dedicated to meeting the healthcare needs of the communities it serves by delivering high-quality, compassionate care.
