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Meet the Oak Crest Leadership Team

Get to know the executive team that governs our community.

Mark Roussey, Executive Director

Mr. Roussey brings more than 25 years of business development, leadership, and oversight of service-delivery operations experience. From 1988 to 2002, he was part of the first-generation leadership team that helped build Allegis Group into one of the largest technical staffing companies worldwide. Mark has also served on staff at Mountain Christian Church in Fallston, launched a successful IT services firm, and served as director of talent acquisition with Proteus Technologies. A resident of Bel Air, Mark holds a B.S. in business administration from Towson University. 

William Tian, Associate Executive Director

Mr. Tian joined Oak Crest in February 2019 with an impressive professional background in operations, health care, and dining. Previously, he worked for Genesis Healthcare, serving as division vice president of dining and allied clinical services. Mr. Tian earned a B.S. in biology from the College of William and Mary in Virginia and holds certifications in culinary arts, food and hospitality management, and adult education techniques from the Culinary Institute of America. He has also received several professional certifications through his affiliation with the American Culinary Federation. A resident of Reisterstown, he volunteers with Special Olympics of Maryland.

Adam Dickson, Associate Executive Director

Mr. Dickson joined Oak Crest in 2018 with more than 10 years of experience with Erickson Living communities. He has held leadership positions at Charlestown in Catonsville, Maryland; Riderwood in Silver Spring, Maryland; and Wind Crest in Denver, Colorado. He is a graduate of Towson University with bachelor’s degrees in health care management, finance, and accounting. Born and raised in Parkville, he now lives in Locust Point with his wife Kelli and two daughters Nora and Celia. He volunteers at St. Ann’s Adult Daycare and participates on the Erickson Living Dragon Boat team for Catholic Charities.

Jim Antonakos, Director of Sales and Marketing

Mr. Antonakos has been with the Erickson Living family of communities for 10 years and previously served as the director of philanthropy at Charlestown and the health insurance resource manager at Oak Crest. Before joining Erickson Living, Jim had a diverse career that included earning the Hometown Heroes Chairman's Award from the Central Maryland Chapter of the American Red Cross for his relief efforts in post-Hurricane Katrina Mississippi. He received a bachelor's degree in communication from Walden University. Jim lives in Baltimore with his wife of nine years, Melinda, and their three children. 

Jill Clippinger, Director of Dining Services

Ms. Clippinger brings more than 20 years of experience in the culinary services industry. She began her career with Oak Crest in 2003 as a restaurant manager before rising to assistant dining services director. Previously, she worked with the Aramark Corporation in its sport and entertainment division in management roles at the Hynes Convention Center in Boston, Massachusetts, and Oriole Park at Camden Yards in Baltimore, Maryland. A graduate of Syracuse University with a bacelor of science degree in restaurant and food service and a minor in finance, Ms. Clippinger is a certified proctor and trainer for ServSafe® of the National Restaurant Association. Ms. Clippinger lives in York Township, Pennsylvania, with her husband and two children. She volunteers her time with the Boy Scouts of America. 

Wendy Kelly, Director of General Services

Ms. Kelly joined Oak Crest in August 2008 with over 30 years of human resources experience. She worked at Mercy Medical Center for 27 years. She holds a bachelor’s degree in human services from the College of Notre Dame and a master’s degree in management of aging services from the Erickson School of Aging at UMBC, both in Baltimore County, Maryland. She is nationally certified as a professional in human resources with the Society of Human Resources. She serves as a board member for the Rose of Sharon Equestrian Center.

Ronald D. Jeffreys, D.O., Medical Director

A member of the medical center at Oak Crest since August 2007, Dr. Jeffreys was named medical director in 2018. Board-certified in internal medicine, Dr. Jeffreys received his bachelor’s degree in psychology from the University of Maryland, College Park, and his master’s degree in psychology/neuropsychopharmacology from American University in Washington, DC. He earned his degree in osteopathic medicine from the Philadelphia College of Osteopathic Medicine in Pennsylvania where he also completed an internal medicine internship. He completed his residency at Franklin Square Hospital in Baltimore County.

Colleen Stafford, Director of Finance

Ms. Stafford began her career with Erickson Living as senior internal auditor in November 2011 and transitioned to senior financial analyst in a regional role. Since 2017, she has served as assistant finance director at Charlestown in Catonsville, Maryland. Previously, Ms. Stafford worked for RSM (formerly McGladrey) as a financial statement auditor, specializing in the nonprofit and health care sectors. A resident of Brewer’s Hill, Ms. Stafford holds a B.S. in accounting from Villa Julie College and an M.B.A. with a concentration in finance from Loyola University of Maryland. She is licensed as a certified public accountant by the State of Maryland.

Tina Kummelman, Director of Human Resources

Ms. Kummelman joined Oak Crest in April 2014. Human Resources works collectively with all lines of service at Oak Crest to establish a positive employment environment, enabling Oak Crest to recruit, develop, and retain the best employees for the purpose of providing an excellent community for the residents. Ms. Kummelman has over 20 years of health services/human resources experience and worked at the LifeBridge Health system for 13 years prior to coming to Oak Crest. She holds a bachelor’s degree from Towson State University and is a member of Chesapeake Human Resources Association and SHRM.

Robin Keeler, Director of Resident Life

Ms. Keeler has nearly 20 years of experience with Erickson Living, most recently serving as a regional home health administrator for Oak Crest and its sister community, Charlestown. Her teams have been consistantly recognized nationally for their superior performance based on overall resident experience, financial management, and quality of care. Prior to joining Erickson Living, she worked at the University of Maryland Medical Center in Baltimore as a shock trauma nurse and at Bel Care, Inc., as a home health nurse and administrator. Ms. Keeler holds a bachelor's degree in nursing and a master of science degree in community health from the Universtiy of Maryland, Baltimore. She resides in Bel Air, Maryland, with her husband Scott and her two children Courtney and Jacob.