Our Simplicity Health Team
“Doctors are so quick to prescribe medication these days. Rarely do they ever try to stop those medications. Often times, those medications aren’t needed or only needed temporarily. The patient is rarely told what they can do to try to fix their problem. Patients will work hard to do what they need to do to fix their medical problems; they just need to know how to do it. They don’t want to have to take medications. One of the most gratifying things to say to a patient is:
‘Congratulations, because of your efforts, we don’t need this medication anymore.’”
— Dr. Opperman
Meet the Team
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Dr. Melissa Butler
INTERNAL MEDICINE
“Dr. Butler is an exceptional physician. She cares about me as a person and not just another patient. She's the BEST!!”
“Dr. Butler is always extremely professional, caring, and very thorough. She is one of the best primary care physicians I have come in contact with.”
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Dr. Josh Wenzell
FAMILY MEDICINE
“Dr. Josh Wenzell is an excellent doctor, someone who truly listens to his patients, who explains what he’s doing and why he’s doing it, and then generously shares relevant research with his patients. He is what most patients hope to see in their doctor. Pretty old-fashioned rock-solid virtues. I’ve been around hundreds of doctors for several decades, having been a hospital psychologist. This doctor is special. I’m glad Dr. Wenzell is my doctor!” -D. Bromberg
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Dr. Charles Opperman
INTERNAL MEDICINE
“Best health care experience of my life! Dr. O bends over backward to give patients the personalized treatment and medical advice they need. He goes above and beyond to care for patients and give them options for treatment depending on what is important to them...” -M. Hamilton
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Michelle Haviln
LICENSED PRACTICAL NURSE
“Michelle is equally supportive, super caring, and a great communicator. When a need comes up unexpectedly, she is always ready to respond rapidly.” -M. Hamilton
“Michelle is the absolute sweetest and always remembers the little details.” -N. Kundu
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Grace
Grace grew up in West Chester, Ohio,and has always had a passion for healthcare. She enjoys working in direct primary care because “there's nothing more rewarding than being able to provide help to those in need, to have the purpose to serve others, and to make a positive difference in the lives of patients and their families.” She also loves that healthcare offers continuous learning, new challenges, and the opportunity to grow every day.
While we’re lucky to have her at Simplicity Health, Grace has big plans for the future—she's preparing to apply to medical school or PA school to continue her journey in medicine.
Outside of work, Grace enjoys pickleball, reading, hiking, kayaking, traveling, and cheering for the Vancouver Canucks. Be sure to say hello when you see her in the office—she’s always happy to help!
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Sara
Sara grew up in Maine and still loves everything about her home state—especially lobster and whoopie pies! Before joining Simplicity Health, she worked as a school counselor in both elementary and high school settings, helping students navigate life’s challenges. As the practice grew, she transitioned to her role as office manager, where she now helps keep things running smoothly alongside her husband, Dr. Opperman.
What Sara loves most about direct primary care is the ability to build deeper, more meaningful relationships with patients—something that sets Simplicity Health apart.
Outside of work, Sara enjoys reading, spending time with her family, and being a mom. She’s also a proud dog mom to her beloved Boston Terrier, Arnie. If you see her around the office, be sure to say hello!
Melissa Butler, MD, FACP
Dr. Melissa Butler is a Board-Certified Internal Medicine physician with extensive experience in both primary care and medical education. She specializes in preventive care, chronic disease management, and evidence-based medicine, with a strong commitment to patient-centered care. Dr. Butler is passionate about medical education and has served as teaching faculty for over a decade at Wright State University Boonshoft School of Medicine and the Kettering Medical Center Residency program, mentoring future physicians.
Dr. Butler was born in Minneapolis, Minnesota, and earned her medical degree from Eastern Virginia Medical School. She completed her residency at Kettering Medical Center, where she served as chief resident. She has also achieved the distinction of Fellow of the American College of Physicians (FACP), a designation recognizing excellence in clinical practice, leadership, and contributions to internal medicine.
With nearly 10 publications in respected medical journals, Dr. Butler remains actively engaged in academic medicine. Outside of work, she enjoys running and has participated in the Boston Marathon numerous times. She also loves traveling internationally and recently attended the Summer Olympics in Paris. Most of all, she enjoys spending time with her family and supporting her children as they compete in collegiate sports.
Josh Wenzell, MD
Dr. Wenzell is a Board-Certified Family Medicine physician with experience in primary care settings for patients of all ages. He provides preventative screening and interventions (e.g. well child checks, cancer screening, heart disease prevention) along with chronic disease management (e.g. diabetes, hypertension, depression). Dr. Wenzell enjoys applying Evidence Based Medicine, empowering patients to incorporate Shared decision-making*, and decreasing or deprescribing unnecessary medications and medical interventions. He enjoys the Direct Primary Care model which allows him ample time to understand his patients and their values and to incorporate them into an overall wellness plan.
Dr. Wenzell is from Enon, OH and completed his Bachelor of Science from Furman University, Medical Doctorate from Wright State University - Boonshoft School of Medicine, and residency at Bethesda Family Practice in Cincinnati, OH where he served as chief resident. He enjoys spending time with his family, playing board games, reading (mainly Sci-Fi and medical history), playing music (piano and French horn), and traveling around the world.
Dr. Wenzell is also fluent in Spanish.
*Shared decision-making means incorporating the best available scientific evidence with each individual patient’s values and priorities. If a medication or other intervention has not been shown to improve a patient’s quantity or quality of life, then it should not be used outside of an experimental setting, which is a hallmark of Evidence Based Medicine.
Charles Opperman, MD, FACP
Dr. Opperman is a Board-Certified Internal Medicine physician. He has experience in both primary care and working with hospitalized patients. As an internal medicine physician, he does not see pediatric patients nor does he typically see OBGYN patients. While most family doctors are learning these skills, internal medicine physicians are honing their expertise in fields such as cardiology, diabetes, gastroenterology, and other areas of adult medicine.
Dr. Opperman is especially focused on managing diabetes, cardiology concerns, and obesity. While these fields are of special interest to him, he also has experience treating all other aspects of adult medicine. Dr. Opperman values spending time with his patients to actually get to know them as people, not just their medical conditions.
Dr. Opperman has served as clinical teaching faculty for Kettering Medical Center Internal Medicine Residency program along with teaching assignments with Wright State University and Ohio University Schools of Medicine.
Dr. Opperman is a graduate of the University of Dayton and completed his residency training at Kettering Medical Center. He enjoys spending time with his family, golfing and most other sports, and is an avid Dayton Flyers basketball fan. He is an active member of his church and frequently volunteers in community outreach programs.
Michelle Havlin, LPN
Michelle is our wonderful and experienced nurse. She attended Sinclair Community College as well as Miami Jacobs Career College. Because of her laid back, outgoing, and friendly personality, Michelle is a patient favorite! She enjoys spending time with her husband and kids—she is a proud mom of two young children. Michelle also enjoys spending time with friends, shopping, and outdoor activities.
“Nursing is all about touching lives and having lives touch yours along the way.”