Biographical Note
Bruce Charles Heezen (April 11, 1924 – June 21, 1977) was an American geologist and worked at Columbia University. Heezen was born in Vinton, Iowa. An only child, he moved at age six with his parents to Muscatine, Iowa, where he graduated from high school in 1942. He received his B.A. from the University of Iowa in 1947. He received his M.A. in 1952 and a Ph.D in 1957 from Columbia University. Heezen collaborated extensively with cartographer Marie Tharp. He interpreted their joint work on the Mid-Atlantic ridge as supporting S. Warren Carey's Expanding Earth Theory, developed in the 1950s, but under Tharp's influence eventually gave up the idea of an expanding earth for a form of continental drift in the mid-1960s. Heezen died of a heart attack in 1977 while on a research cruise to study the Mid-Atlantic Ridge near Iceland aboard the NR-1 submarine. The Oceanographic Survey Ship USNS Bruce C. Heezen was christened in honor of him in 1999.
Marie Tharp (July 30, 1920 - August 23, 2006) was an American geologist and oceanographic cartographer. Tharp's work revealed the presence of the Mid-Atlantic Ridge, causing a paradigm shift in earth science that led to acceptance of the theories of plate tectonics and continental drift.