Keywords: Letherman Home Canonsburg PA.jpg In 1852 Phi Kappa Psi Fraternity was founded in the attic of the house that stood here where founder William Letterman the spelling he used lived with his widowed mother His brother Jonathan devised the MASH concept during the Civil War http //www canonsburgboro com/History/Pictures/Mrkr09R-T25_w j_cowey jpg Canonsburg's Historical Markers Published in 1895 book T Maxwell Potts who lived in the home Public domain by age PD-old Canonsburg Pennsylvania Washington Jefferson College buildings Phi Kappa Psi buildings |