 Griebel also earned a Juris Doctor from Suffolk University in 1977.The Dartmouth baseball team represented New England in the 1970 College World Series.Griebel has served on the boards of the Annual Fund of the United Way of the Central Naugatuck Valley, Bradley International Airport, the Connecticut Business and Industry Association, 
the Connecticut Transportation Strategy Board, Junior Achievement of Central Connecticut, the Mark Twain House, Northwest Catholic High School, Riverfront Recapture, the University of Hartford, the Wadsworth Atheneum, the Waterbury Foundation, and Yale-New Haven Hospital.