William Rollow, MD, MPH, ABIHM
Dr. Rollow received a BA in psychology from Harvard University in 1973, an MD from Stanford Medical School in 1977, and an MPH from University of Michigan in 1986. He completed a residency in Family Medicine at Cook County Hospital in Chicago in 1980. He has been certified by the American Board of Family Medicine and the American Board of Holistic and Integrative Medicine. He is Adjunct Professor in Family and Community Medicine at the University of Maryland, and formerly directed the University of Maryland Center for Integrative Health and Healing.
Clinical Expertise
In addition to having ability to provide integrative care for the full spectrum of adult and pediatric issues, Dr. Rollow has specialized interest in:
- Lyme/mold/toxic illness
- Cancer
- Cognitive and psychiatric disorders, including dementia using Bredesen’s approach
Personal Statement
I am deeply grateful for the opportunity to connect with and learn from my relationship with you. I approach each encounter with the intent to understand the underlying issues that are affecting your life and your health. I see my role as to provide guidance among the multitude of options that are available during your healing process, and to be with you as it evolves.
Maria Shesiuk, PA-C
Physician Assistant
Maria Shesiuk PA-C received a BS in Psychology from Wayne State University in 2010 and MS in Physician Assistant studies from the Towson CCBC PA program in 2012, with hospital-based experience in medical coverage of multiple surgical specialties. She is an avid athlete, currently competing in Olympic style of weightlifting on a national level. She is also a yoga teacher and a USAW level 1 coach.
Clinical Expertise
In addition to providing integrative care for the full range of adolescent and adult issues, Maria has expertise in:
- Chronic medical illness, including Lyme/coinfections, mold, and chronic fatigue
- Dietary, herbal, and stress-reducing treatments for GI conditions
- Bioidentical hormonal treatment
- Treatment of thyroid conditions including Hashimotos
- Optimizing healthy aging and physical and cognitive performance through standard and specialized testing and treatment
- Use of low carbohydrate, ketogenic, and animal-based diets in health optimization and chronic medical conditions
- Improving sports performance as well as growth mindset training
- Use of breath-based and integrative techniques in addressing mind/body disorders
Personal Statement
My professional and personal experience has taught me the importance of physical activity, diet, and use of nutrients/supplements in healing medical conditions and optimizing health as we age. My desire is not to simply treat symptoms and manage illness, but to help you maximize your levels of energy and vitality so that you can truly enjoy life. We have many powerful tools to help the body heal itself. With an open mind and a large dose of curiosity I have used integrative practices to heal myself and to help others do the same. I view you as the practitioner and myself as your facilitator in healing.
Catherine (Cassie) Willsey, CRNP
Nurse Practitioner
Nurse Practitioner
Catherine (Cassie) Willsey, CRNP
Cassie Willsey, CRNP is a certified registered nurse practitioner with a background in both conventional and integrative healthcare. She holds a Bachelor of Science in Public Health Science from the University of Maryland College Park and an Associate Degree in Nursing from Howard Community College. She completed her Master of Science in Nursing, specializing in Adult-Gerontology Acute Care in August 2025.
Cassie brings a diverse range of experience from some of the region’s most respected medical centers, including the University of Maryland Medical Center and Johns Hopkins Hospital, where she worked in acute and critical care settings. Cassie began her journey at Integrative Health Practices seven years ago. As her education advanced, so did her role within the practice—from nursing services to Infusion Nurse Coordinator and in November to direct patient care provider.
Clinical Expertise
Cassie integrates functional and conventional medicine in the primary and consultative care of adults and teens over the age of thirteen. She has a particular interest in:
- Use of hormonal therapies in addressing symptoms associated with menstrual cycle, hypothyroidism, and aging
- Treatment of gastrointestinal disorders
- Integrative care of patients with cancer
- Whole-body wellness and chronic illness treatment through integrative modalities including Infusion therapies
Personal Statement
I am guided by a deep belief in the body’s innate capacity to heal and am passionate about empowering individuals to become active participants in their health journeys. As a nurse, I’ve had the privilege of developing close relationships with patients and their families. These connections have deepened my understanding of how illness impacts the whole person—not just physically, but emotionally and spiritually as well. My approach is shaped not only by my clinical experiences, but by my own family’s experience navigating chronic autoimmune illness. I’ve seen firsthand how blending conventional and holistic therapies can lead to profound healing. I believe in meeting people where they are—with compassion, curiosity, and a commitment to lifelong wellness.