Walter Herman Penney, 48, who worked in the technology field for about 25 years and left the Bureau of National Affairs in November as director of information technology, died Jan. 10 at Holy Cross Hospital.

A Montgomery County police spokeswoman said Mr. Penney was bicycling north on Sligo Creek Parkway near Dallas Avenue in Silver Spring when a southbound car struck him after crossing the center line. She said the cause is pending further investigation.

Mr. Penney, a Greenbelt native, was a 1969 graduate of High Point High School. He was a 1972 mathematics graduate of the University of Maryland, where he was elected to Phi Beta Kappa.

In the 1970s and early 1980s, he was an engineer at PBS and played a key role in fashioning its closed-captioning system for the hearing impaired. The public television system's engineering group won an Emmy Award in 1980 for its work.

In the 1980s, he helped found Media Cybernetics in Silver Spring and was its vice president of engineering.

He went to Verdix Corp. in Chantilly in 1990 as manager of its technical support staff and then became director of imaging services at Lockheed Martin in Washington in the mid-1990s.

He contributed articles about computer imaging to journals, such as BYTE magazine.

His volunteer coaching experience included the Takoma Park City Basketball League. He managed the Franklin Knolls Gators swim team in Silver Spring and was a coordinator for the Montgomery County swim league.

He participated in triathlons, the Marine Corps marathon and other competitions.

He designed and built his Takoma Park home.

Survivors include his wife, Cheryl Brand of Takoma Park; two children, Vanessa L. Penney and Walter D. Penney, both of Takoma Park; his mother, Leonie Penney of Greenbelt; a brother, Bernard Penney of Chapel Hill, N.C.; and a sister, Olga Garber of Leesburg.