Constantine A. ‘Dean’ Sismanidis

Constantine A. “Dean” Sismanidis, a senior software engineer with Boeing in Fairfax City, died Jan. 10 at George Washington University Hospital in Washington. He was 59.

The cause was a massive cerebral hemorrhage, said his sister, Roxane Sismanidis.

Mr. Sismanidis, a Washington resident, began working in the early 1980s at Inco. Ltd., which would later be absorbed by McDonnell Douglas. In 1997, McDonnell Douglas merged with Boeing.

Constantine Aristotelis Sismanidis was a native Washingtonian and a 1972 graduate of Woodrow Wilson High School. He was a 1976 graduate of American University and received a master’s degree in chemistry from Florida State University in 1979.

Mr. Sismanidis lived and worked in California’s Silicon Valley before returning to Washington in the early 1980s.

His memberships included St. Constantine and Helen Greek Orthodox Church in Washington.

Survivors include a sister, Roxane Sismanidis of Washington.

— Megan McDonough