William Lowell Putnam any dramatic changes in the Observatory's staff or location. Thus, an Observatory expedition and possibly a permanent move to South America was postponed, effectively establishing the Observatory in Flagstaff, Arizona. Despite his conviction that he should not make any major changes to the Observatory, Putnam did become embroiled in the controversy surrounding T. J. J. See. See was employed at Lowell Observatory at that time, but was both an extremely unpopular man and also regarded as a bad scientist. Three Observatory employees had already resigned due to See's poor treatment of them, and Douglass began working to remove See from
Lowell Observatory Flagstaff. Also located on the Mars Hill campus is the Pluto Discovery Telescope, used by Clyde Tombaugh in 1930 to discover the dwarf planet Pluto. Lowell Observatory currently operates four research telescopes at its Anderson Mesa dark-sky site, located southeast of Flagstaff, including the Perkins Telescope (in partnership with Boston University) and the John S. Hall Telescope. Lowell is a partner with the United States Naval Observatory and Naval Research Laboratory in the Navy Precision Optical Interferometer (NPOI) also located at that site. The Observatory also operates smaller research telescopes at its historic site on Mars Hill and in Australia