Percival Lowell Percival Lowell Percival Lawrence Lowell (; March 13, 1855 – November 12, 1916) was an American businessman, author, mathematician, and astronomer who fueled speculation that there were canals on Mars. He founded the Lowell Observatory in Flagstaff, Arizona and formed the beginning of the effort that led to the discovery of Pluto 14 years after his death. Percival Lowell was born on March 13, 1855, in Boston, Massachusetts, the first son of Augustus Lowell and Katherine Bigelow Lowell. A member of the Brahmin Lowell family, his siblings included the poet Amy Lowell, the educator and legal scholar Abbott Lawrence Lowell,
Guy Lowell Guy's ancestors, the celebrated American writer, poet, and foreign diplomat James Russell Lowell (1819–1891). As Percival Lowell's third cousin, Guy became the sole trustee of the Lowell Observatory after his cousin's death in 1916. Lowell also made a name for himself as a landscape architect. His obituary in "The New York Times" notes that he designed or "fitted up" gardens for the elder J. Pierpont Morgan, Andrew Carnegie, and the Piping Rock Club. Additional garden-related projects included those of T. Jefferson Coolidge, Mrs. Oscar Lasigi in Stockbridge, Massachusetts, and Payne Whitney in Manhasett on Long Island. Lowell designed many of