Dennis Francis Hasson, a retired Naval Academy professor, died Tuesday of emphysema and congestive heart failure at his Severna Park home.
He was 77.
The son of a stationary engineer and a homemaker, Dr. Hasson was raised in Hamilton. After graduating in 1952 from Polytechnic Institute, he earned a bachelor's degree in 1955 in mechanical engineering from the Johns Hopkins University.
He earned a master's degree in 1958 in aerospace engineering from Virginia Polytechnic Institute and State University. In 1970, he earned his doctorate in materials science from the University of Maryland, College Park.
Dr. Hasson began working in 1958 for the National Advisory Committee for Aeronautics, which was a forerunner of the National Aeronautics and Space Administration, in high Mach-number experimental aerodynamics and with manned and unmanned space vehicles.
He left NASA in 1970 when he became an instructor in the University of Maryland's department of mechanical engineering, and from 1971 to 1973 was an associate professor at the Washington Technical Institute, now the University of the District of Columbia.
Dr. Hasson joined the faculty of the mechanical engineering department at the Naval Academy in 1973, and with his background in materials engineering, developed and taught a course in material processing and the processing of composite materials.
In addition, he was a member of the Naval Academy Research Committee, member and chairman of the Trident Scholar Committee, and manager of the materials laboratory.
During his career, he wrote widely on materials engineering and conducted research on advanced materials with several Navy laboratories and the Office of Naval Research.
He also wrote a column for the Journal of Metals and was a fellow of both the American Society of Metals and the American Society of Mechanical Engineers.
Dr. Hasson had been named Mechanical Engineering Professor of the Year and Mechanical Engineering Researcher of the Year and was awarded the Navy Meritorious Civilian Service Medal.
Even though he retired in 2000, he continued his relationship with the Naval Academy as professor emeritus.
He was a stamp collector and enjoyed traveling.
"His research was his major hobby," said a son, Dennis J. Hasson of Severna Park.
Dr. Hasson was a communicant and usher at the 10:30 a.m. Sunday Mass at St. John the Evangelist Roman Catholic Church in Severna Park.
A Mass of Christian burial will be offered at 10:30 a.m. Saturday at St. John Neumann Roman Catholic Church, 620 N. Bestgate Road, Annapolis.
Also surviving are his wife of 50 years, the former Eugenia Frances "Jean" Eyring; another son, Leonard J. Hasson of Annapolis; and three grandchildren.