Concord Hospital Medical Group welcomes two new internal medicine providers

LACONIA — Dr. William Logan and Dr. Ramon Hendrik Guillen have joined the medical staff at Concord Hospital Internal Medicine – Laconia.

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 (1992-95) and internal medicine at UNC Hospitals (1995-98). He later completed a fellowship in geriatrics at Duke University (2004-06). In addition to his clinical work, Logan holds an advanced business degree from the University of Tennessee, Haslam School of Business (2020).

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. 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.”

For more information, visit concordhospital.org.