Frederick V. Thomas, company president Frederick V. Thomas, the founder and president of a real estate company, died Nov. 28 at his home in Chevy Chase. The cause was Alzheimer's disease, said his daughter, Maria Thomas-Wenzel. Mr. Thomas began his career as a science teacher in Prince George's County before founding the real estate firm Thomas & Kelley in 1965. He retired in the late 1990s. Frederick Vincent Thomas was a native of Troy, N.Y., and a 1952 graduate of the University of Richmond. He was a petty officer in the Navy during World War II. Mr. Thomas was a member of the choir at the Shrine of the Most Blessed Sacrament in the District. Survivors include his wife of 47 years, Rosalma LaGravinese Thomas of Chevy Chase; and two children, Maria Thomas-Wenzel of Silver Spring and Frederick Thomas Jr. of Delray Beach, Fla.