Dennis J Sysko of Millersville, Maryland peacefully passed away at his wife's side on June 30, 2023 due to Parkinson's disease at the age of 76. He is survived by his wife of 52 years, Bonnie Sysko; four children, Jen Bihn (Larry) of Holland OH, Becky Ackerman (Seth) of Severna Park MD, Bryan Sysko of Millersville MD and Mandy Wallace (Bruce) of Millersville MD, seven grandchildren and his sister, Melanie Lay of Torrington, CT.

Dennis was born on March 28, 1947 in Derby, Connecticut, son of the late Zigmond and Mary Sysko.  He received his Bachelor of Science in Electrical Engineering from the University of New Haven in 1970 and his Juris Doctorate from the University of Baltimore in 1976. He was employed by the National Security Agency from 1970 to 1996 and co-founded The Law Office of Henault and Sysko, Chartered in 1980 and remained a senior partner until his retirement in 2017.

Some of his areas of practice were National Security Law; Security Clearance Appeals; Technology Law; Intellectual Property; Business Start-Ups; Government Contracting; Corporate Law; Adverse Actions; Business Associations; Intellectual Property Law; and National Security Agency Cases.

Dennis served as an adjunct professor, University of Baltimore School of Law; served as Administrative Judge, U.S. Equal Opportunity Commission and provided pro-bono legal services for Assistance League® of the Chesapeake.

Dennis enjoyed spending time with his family, gardening and fishing.

A Mass of Christian Burial will be offered on July 18 at 11:00 am at Our Lady of the Fields Roman Catholic Church, 1070 Cecil Avenue South Millersville, Maryland 21108.

Interment and luncheon to follow immediately after the Mass.

Memorial contributions may be made to: The Parkinson Foundation of the National Capital Area - 3570 Olney Laytonsville Road, Olney, MD 20830 or Assistance League® of the Chesapeake, Inc. - P.O. Box 1774, Millersville MD, 21108