Mike Sims, Associate Executive Director

Mike Sims has an extensive background in leading long-term care communities. He began his career in Galveston with Moody House, Inc. (currently, Methodist Retirement Communities), and later served as the executive director of Crestview Retirement Community in Bryan, Texas. After that he joined Sisters of Charity of the Incarnate Word, Houston, as the executive director of Regis Retirement and St. Elizabeth Nursing Home in Waco, Texas. Mike has also served as the interim executive director at St. Joseph’s Villa in Salt Lake City, Utah, and as the administrator of St. Anthony’s Center in Houston. While Mike was the vice president for long-term care services with Providence Healthcare Network Waco, Texas, he was responsible for consolidating the two Catholic systems providing services to the elderly into one provider. In 2004, Mike joined Sears Methodist Retirement System (SMRS) and served as the start-up executive director for Wesley Woods Alzheimer’s Care Center in Waco until 2006 when he became the senior vice president of operations. During his 10-year career with SMRS he served in multiple roles including the vice president of veterans services.

Mike has been involved in professional, civic, and community organizations during his career. He has served on the House of Delegates and Nominating Committee for American Association of Homes and Services for Aging (currently LeadingAge), the Board of Directors of Texas Association of Homes and Services for Aging (LeadingAge Texas) and the Board for Educational Institute on Aging. He was appointed to the Texas Board of Nursing Facility Administrators from 1993-1997, which he served as the chairman during this time. In May 1998, the Texas Association of Homes and Services for the Aging presented their highest award to Mr. Sims, the Award of Honor.

Mike is a licensed nursing home administrator. He received his BBA from Lamar University in Beaumont, Texas, and his MBA from Baylor University in Waco, Texas.

Heather Ashby, Independent Living/Assisted Living Residential Manager


Heather Ashby is a native of Dallas, Texas. Her love for seniors was encouraged by her mother and grandmother. As a young child she volunteered with her mother and grandmother at a faith-based nursing home in the Dallas area. She continued to volunteer in nursing homes in both Dallas and Abilene as she grew up. Her love for seniors finally aligned with her career path in 2004 when she started working in long-term care communities. She has served the residents of PVN since 2009. She currently is the director of residential and assisted living services.

Dr. Lisa Clark, Medical Director


Dr. Lisa Clark is a graduate of the University of Mississippi Medical School and completed her residency at Presbyterian Hospital in Dallas. For nearly three decades, Dr. Clark has worked at PVN as the community’s medical director. Dr. Clark was drawn to working with seniors because of her passion for improving a person’s quality of life through problem solving. Her responsibilities at PVN include making rounds in the healthcare area, visiting with staff at each nurses’ station and seeing patients that have visits scheduled that day, as well as performing administrative duties. Dr. Clark serves on the Quality Assurance committee, the Patient Safety committee, the Presbyterian Village North board and the Presbyterian Communities and Services board. Dr. Clark is board-certified in Internal Medicine and in Geriatrics, a certification that requires taking an exam every ten years to maintain certification. She is part of a small niche of doctors with a certification in geriatrics. In 2014, she was selected as one of D Magazine’s best doctors in the Dallas area, making this the tenth year she has been on the list either under geriatrics or internal medicine.

Dr. Diana Kerwin, Medical Director – Memory Care Program


Dr. Kerwin is a board-certified internist and medical director at Texas Alzheimer’s and Memory Disorders, a Texas Health Physicians Group practice on the campus of Texas Health Presbyterian Hospital Dallas. She focuses on the development of comprehensive treatment plans for patients and families to prevent cognitive and functional decline in people with Alzheimer’s disease and other cognitive disorders. She has lectured extensively on cognitive aging and Alzheimer’s disease, is a member of the National Board of the Alzheimer’s Association and is chairperson of the Dallas chapter of the Alzheimer’s Association. She completed her fellowship training in geriatrics at Northwestern University’s Feinberg School of Medicine in Chicago, where she was an assistant professor in the Department of Medicine and faculty member of the Cognitive Neurology and Alzheimer’s Disease Center, which is funded by the National Institute on Aging. There, she oversaw clinical trials and research for the development of treatments and diagnostic tools for Alzheimer’s and other cognitive disorders. She served on the national Alzheimer’s Disease Cooperative Studies Steering Committee, as chair of the Medical Safety Committee for the LIFE (Lifestyle Interventions and Independence for Elders) study, and as the academic partner on several community initiatives to improve the care of senior adults with dementia in underserved areas. For more information visit, TexasAlzheimersandMemoryDisorders.com.