James Edward Keeler (1857-1900), American astronomer, late 1890s.
© Science Museum / Science & Society Picture Library
Portrait by Hildebrandt. Keeler (1857-1900) was director of the Allegheny Observatory (1891-98) and the Lick Observatory from 1898. He established the composition of Saturn's rings and conducted important spectroscopic work on nebulae, discovering 12,000 of them.