John C. Houbolt, 95, an engineer whose contributions to the U.S. space program were vital to NASA's moon landing in 1969, died April 15 at a nursing home in Scarborough, Maine, of complications from Parkinson's disease.

As NASA describes on its website, while under pressure during the U.S.-Soviet space race, Mr. Houbolt was the catalyst in securing U.S. commitment to the science and engineering theory that eventually carried the Apollo crew to the moon and back safely. - AP