he Lick Observatory (1930–1935), and as associate director under W. W. Campbell {see planet  (2751)} he ran the Observatory when the latter was also president of the University of California (1923–1930). During his 40 years at Lick Aitken became the leading authority on double stars, his work culminating in the publication of his New General Catalogue of Double Stars within 120 degrees of the North Pole, published in two large volumes in 1932. His book The Binary Stars was published in 1918, and an updated second edition appeared in 1935. (M 14481) _ _.