George Blatz Rathmann (1927–2012) was an American chemist, biologist, pioneer in biotechnology and corporate executive.
He had originally planned to attend medical school, before switching to physical chemistry and obtained a B.S.
At Abbott, Rathmann became interested in recombinant DNA and other aspects of biotechnology, and was recruited in 1980 by venture capitalists to help found Amgen, where he would serve as chairman, president and CEO.
In 1983, Rathmann joined the board of directors of the newly formed Biotechnology Industry Organization, and served as its chairman from 1987 to 1988.
Rathmann left the company in February 2000, and was replaced as CEO and chairman by Paul Clark, a former executive at Abbott, under whom Icos would decline and eventually be sold off to Eli Lilly.