Frederik Pohl blogged yesterday about his late freind and sf great Algis Budrys. While he doesn't enjoy the high profile of some of his contemporaries, Budrys wrote some great novels that still hold up today.
His most famous novel is the Cold War sf thriller Who? (1958) which was turned into a film nearly twenty years later in 1973.
My personal favorite of his books, Rogue Moon (1960) is a psychologically astute novel about the exploration of a mysterious and deadly alien artifact on the moon.
Another great book by Budrys, Michaelmas (1977) is one of the best novels of the era and compares favorable to some of Brunner's famous books of the time.