Robert S. Tiemann, 55, an educational programs officer for the National Aeronautics and Space Administration, died Wednesday at Holy Cross Hospital in Silver Spring after a heart attack.

He managed the NASA-National Science Teachers Association's Youth Science Congress Prgoram, the Skylab and Viking student projects, the deveopment of an industrial arts resource unit's booklet and the educational programs division's exhibit program.

Mr. Tiemann also lectured frequently at meetings, seminars, conferences and symposiums.

He had joined the National Advisory Committee on Aeronautics, predecessor of NASA, in 1954 as a personnel projects and recruitment officer. He helped set up the northeastern offices that became the Electronics Research Center in Cambridge, Mass.

Mr. Tiemann was born in Boston. He gradusted from Northeastern University there and did graduate work at American University in Washington.

He came to this area in the late 1940s and was a research psychologist with the Department of the Army before joining NACA.

He was a charter member of the Wheaton Lodge of B'nai B'rith and a member of Temple Emanuel in Kensington. He also was active in Boy Scout work and the YMCA Indian Guides.

He is survived by his wife, Florence Blumenthal, two daughters, Ellen and Katy, and a son, Jon, all of the home in Wheaton; another son, Michael, of Eugene, Ore.; his mother, Sarah Tiemann, of Boston, and one grandchild.