About
Mark L. Timmerman, MD, FAAFP earned his Bachelor of Science in Biology from Loras College in Dubuque, Iowa before completing his medical degree at The University of Iowa College of Medicine in 1983. He completed his internship at The Altoona Hospital in Pennsylvania, then finished his Family Medicine residency at Conemaugh Valley Memorial Hospital in Johnstown. The American Board of Family Medicine recognizes his board certification, and he holds fellowship status in the American Academy of Family Physicians. He also belongs to the New Hampshire Academy of Family Physicians.
Dr. Timmerman has practiced in Merrimack since the early 1990s, building patient relationships that span more than three decades. He sees patients of all ages, from newborns to older adults, with clinical interests that include cardiovascular disease, pulmonary conditions, endocrine and hormonal disorders, inflammatory diseases, and dermatology. Patients consistently describe him as a great listener who invests serious time in every appointment. His wife Julianne works alongside him, deepening the level of personal support the practice delivers. Outside the office, he enjoys biking and photographing wildlife.
Education & Training
Undergraduate
Loras College, Dubuque, IA - Bachelor of Science, Biology, 1978
Medical School
The University of Iowa College of Medicine, Iowa City, IA - Doctorate of Medicine, 1983
Residency
Conemaugh Valley Memorial Hospital, Johnstown, PA - Family Medicine, 1985-1987
Additional Training
Internship: The Altoona Hospital, Altoona, PA, 1983-1985
Certifications
Conditions Treated
Who is Dr. Timmerman right for?
Dr. Timmerman is a strong fit for patients of any age who want a long-term relationship with one physician. Adults managing cardiovascular disease, hormonal disorders, or pulmonary conditions benefit from his deep clinical focus. Families with newborns through older adults can receive care under one roof. Patients who value thorough, unhurried appointments and proactive preventive planning find his approach particularly well-suited to their needs.
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Frequently Asked Questions
Dr. Timmerman treats a broad range of conditions across all age groups. His clinical focus includes cardiovascular disease, hypertension, cholesterol concerns, pulmonary conditions, endocrine and hormonal disorders, and inflammatory diseases. He also addresses musculoskeletal, gastrointestinal, genitourinary, and dermatological concerns. Patients from newborns to older adults receive care at his Merrimack practice.
Yes, Dr. Timmerman holds board certification from the American Board of Family Medicine. He also carries fellowship status in the American Academy of Family Physicians and belongs to the New Hampshire Academy of Family Physicians.
Dr. Timmerman earned his medical degree at The University of Iowa College of Medicine in 1983. He completed his internship at The Altoona Hospital in Pennsylvania, then finished his Family Medicine residency at Conemaugh Valley Memorial Hospital in Johnstown, Pennsylvania. He has practiced in Merrimack since the early 1990s.
Yes, Dr. Timmerman sees patients across every stage of life, from newborns through older adults. His family medicine background gives him the clinical range to care for an entire household. Many of his patient relationships span more than three decades.
Dr. Timmerman invests serious time in each appointment and focuses on building long-term relationships with his patients. He pairs that personal approach with comprehensive wellness screenings that help catch emerging or chronic problems early. His wife Julianne also supports patients through the practice, adding another layer of personal care.
Dr. Timmerman emphasizes prevention through his Annual Wellness Program, which uses comprehensive screening tools and hands-on testing. He then builds individualized health plans targeting each patient's specific goals. His preventive focus covers cardiovascular risk, hormonal health, pulmonary function, and chronic disease management.
Dr. Timmerman maintains an affiliation with Catholic Medical Center. Patients who need hospital-level care benefit from that established connection.
Doctor profile last updated March 21, 2026