His practice, Henry C. Clarke, Jr., P.A. is located in Gaithersburg, but he practices throughout Maryland. His practice focuses on estate planning, wills, trusts, special needs trusts, Advance Medical Directives, and, additionally, small business creation, contractual, sale and succession matters. Mr. Clarke is active on various boards including the non-profit Rockville Nursing Home and the Montgomery County Law Enforcement Officers Relief Fund. He is the sibling of a special needs adult.