Thurman D. Donovan, 60, a founder and the president of Donovan Feola Balderson & Associates Inc., landscape architects with offices in Gaithersburg, died of cancer Aug. 19 at Holy Cross Hospital.

Mr. Donovan, who lived in Boonsboro, Md., was born in Dayton, Ohio. During World War II, he served in the Army in Europe and the Philippines. He later took a bachelor's degree in horticulture at the University of Maryland and another in landscape architecture at the University of Illinois. He worked in New York briefly and then returned to Washington.

In 1959, he founded Donovan Feola Balderson & Associates. Projects on which Mr. Donovan worked include the Washingtonian Golf and Country Club and Montgomery Village in Gaithersburg, Rossmoor Leisure World in Silver Spring and Crystal City in Arlington.

Mr. Donovan was a member of the American Society of Landscape Architects and had received awards from the American Association of Nurserymen Landscape Contractors Association and the Maryland Chapter of the American Society of Landscape Architects.

He was a member of the National Muzzle Loaders Association, an organization of persons who use antique firearms.

His marriage to Margaret C. Donovan ended in divorce.

Survivors include his wife, Ann, of Boonsboro; two children by his first marriage, Jamie D. Ortengren of Millburn, N.J., and Susan S. Donovan of Holliston, Mass.; three stepchildren, Alice C. Slavik of Brooklandville, Md., Richard L. Compton Jr. of Virginia, Ill., and Edward A. Compton of Silver Spring, and one brother, Donald E., of Silver Spring.