 The first trustee was Lowell's third cousin Guy Lowell (1916–1927).Percival's nephew Roger Putnam served from 1927 to 1967, followed by Roger's son Michael (1967–1987), Michael's brother William Lowell Putnam III (1987–2013), and current trustee W. Lowell Putnam.Multiple astronauts attended the Lowell Observatory while the moon was being mapped for the Apollo Program.