About
Samuel E. W. Johnsen, MD, brings more than 25 years of internal medicine experience to his Lahaina practice. He earned his Bachelor of Science in Cellular Biology from the University of British Columbia in Vancouver in 1987. He went on to complete his Doctorate of Medicine at the American University of the Caribbean School of Medicine in Plymouth, Montserrat in 1992. He completed both his internship and internal medicine residency at Memorial Medical Center in Savannah, Georgia, finishing in 1996. He holds board certification from the American Board of Internal Medicine and holds a Hawaii medical license.
Dr. Johnsen focuses on preventive care and builds a detailed action plan with each patient around their personal health goals. He places strong emphasis on exploring each patient's full medical history before recommending a course of care. Patients reach him directly by phone after hours and on weekends. 9 out of 5 rating from patients who value his thoroughness, availability, and calm approach to treatment.
Education & Training
Undergraduate
University of British Columbia, Vancouver, British Columbia, Canada — Bachelor of Science, Cellular Biology, 1987
Medical School
American University of the Caribbean School of Medicine, Plymouth, Montserrat, British West Indies — Doctorate of Medicine, 1992
Residency
Internal Medicine, Memorial Medical Center, Savannah, GA, 1994-1996
Additional Training
Internship: Memorial Medical Center, Savannah, GA, 1993-1994
Certifications
Who is Dr. Johnsen right for?
Dr. Johnsen is a strong fit for adults on Maui who want a primary care physician focused on prevention and long-term wellness. Patients managing chronic conditions such as high cholesterol, hypertension, or type 2 diabetes benefit from his thorough, individualized approach. He works well with patients who value direct access to their physician, including after-hours phone availability. Anyone seeking comprehensive annual health screenings and a personalized wellness plan will find his MDVIP model a good match.
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Frequently Asked Questions
Dr. Johnsen specializes in internal medicine, primary care, and preventive medicine. He focuses on understanding each patient's full medical history and building a personalized wellness plan around their specific health goals. His clinical emphasis on prevention makes him particularly effective for adults managing chronic conditions or working to avoid them.
Yes. Dr. Johnsen holds board certification from the American Board of Internal Medicine. He also holds a Hawaii medical license and maintains a hospital affiliation with Maui Memorial Medical Center.
Dr. Johnsen earned his medical degree from the American University of the Caribbean School of Medicine in Plymouth, Montserrat in 1992. He completed his internship and internal medicine residency at Memorial Medical Center in Savannah, Georgia, finishing his residency in 1996. Before medical school, he studied Cellular Biology at the University of British Columbia in Vancouver.
Dr. Johnsen has practiced internal medicine for over 25 years. His patients on Maui include individuals who have followed him through multiple practice settings over that time.
Yes. Dr. Johnsen stays reachable by phone after hours and on weekends. Members can contact him directly for urgent concerns without waiting for the next business day.
Every office visit is with Dr. Johnsen directly. His practice does not route patients to nurse practitioners or physician assistants. That consistency is a deliberate feature of how he runs his practice.
Dr. Johnsen takes time to explore each patient's medical history in depth and works with them to build a detailed action plan toward their health goals. He emphasizes prevention and overall wellness rather than reactive treatment. Patients describe him as thorough, calm, and attentive to individual needs.
Yes. Dr. Johnsen can help arrange care with a local hospital, pharmacy, or physician when members need urgent attention while traveling. This travel benefit is part of the MDVIP membership.
Doctor profile last updated June 6, 2026