James “Jim” Stewart–the chief diving officer emeritus at the Scripps Institution of Oceanography and the so-called “father” of the U.S. Antarctic Program’s diving program–died in Irvine, California on June 7 at the age of 89. Stewart adapted the scientific-diving best practices that he helped develop for the American Academy of Underwater Sciences to produce guidelines for the U.S. Arctic and Antarctic programs, procedures still used to this day.