Harry Browne and Andrew J. Galambos
Browne is known as the libertarian investment guru who wrote books like How I Found Freedom in an Unfree World. Browne represented the Libertarian Party in two presidential elections. His voice was consistent and principled. He was a giant.
Galambos was the unknown libertarian, but those who met him and the students in his courses seemed profoundly effected by him and his Free Enterprise Institute. Browne was not permitted to teach ideas that Galambos maintained were his. Students were not allowed to tell you about the mysterious classes.