Mark Monroe Wilbur, 74, of Reston, Virginia, passed away suddenly at his residence on Friday, October 16, 2020. He donated his skin to others who needed it. Mark was born on May 5, 1946, in Cheverly, Maryland, the beloved son of Glenmore and June (Carlson) Wilbur. His outgoing personality and friendliness were always matched by an energy that inspired those around him. Mark studied at the University of Maryland and graduated cum laude in Electrical Engineering in 1968. He retired from Lockheed Martin in 2010 after serving on his proudest project, the F-35 Joint Strike Fighter. Mark loved his family the most, and he was forever determined to make sure his loved ones enjoyed life. He sought every opportunity to show his daughter Katie the world, and he was immensely proud of her academic and professional achievements. After moving to Virginia recently to be near his daughter Erin and her family, Mark spent many cherished hours with his grandsons, encouraging them to pursue their dreams. The University of Maryland in College Park always held a special place in Mark’s heart, as it was his boyhood home where his mother spent her entire professional career as a professor, having been honored with Emeritus status in 1978. In 2018, Mark was honored as a Golden Terp Engineer at his 50th reunion at the A. James Clark School of Engineering. Mr. Wilbur is survived by his previous wives, Ann Wilbur (Saltzman) and Lynne Delancey, daughters Katie Wilbur of Brookline, MA, Erin Wirtanen (Chris) of Great Falls, VA and Kelly Sheffer (Peter) of Anchorage, AK; grandchildren Luke Wirtanen, Rex Wirtanen, Ry Sheffer and Blaze Sheffer; his sister, Laura (Lucian) Heflin, Sewickley, PA as well as niece Jennifer and nephews Jeffrey, James, and John and their families. He was preceded in death by his parents.