Percy Ploss (February 21, 1928 - August 1, 2013) graduated with a Diploma in Printing Management from the first graduating class at Ryerson Polytechnical Institute in 1950. Ploss was born in Saskatoon, Saskatchewan, and spent much of his youth in Welland, Ontario. He attended Welland High School and served as a member of the Royal Canadian Air Force. He began attending Ryerson in 1949. While there, Ploss helped start The Little Daily newspaper, acting as its Managing Editor and producing the first colour plate for the publication. He was awarded the Toronto Club of Printing House Craftsmen Scholarship in 1950 and was a member of the Gamma Epsilon Tau Fraternity. After graduation, Ploss began a career in printing and publishing. Over the course of this career, he worked for General Printers (Lindsay, ON), Arta Publishing (Toronto, ON), and as an owner of Bell Offset Printing (Toronto, ON). Following his retirement, he undertook a number of entrepreneurial ventures in Ontario, including a gas bar in Huntsville and a plastics company in Hespeler.

Fonds consists of textual records, books and manuals accumulated by Ploss while a student at Ryerson and throughout the course of his printing career.