Age 90 of Mt. Lebanon, passed away peacefully on Tuesday March 10, 2015 surrounded with the love of his family. William, the son of Thomas Hartocollis and Mary (Mandrapelias) Hartocollis of Mani, Greece was born August 9, 1924 in Bay City, Michigan. William moved to Greece when he was 6 years old, graduated high school in Athen and moved back to the United States at the age of 18. William was self-employed as a New York Life Insurance Agent, Betsy Ross restaurant owner and owner of investment real estate properties. William was the beloved husband of Marya (Patrinos) Hart for 61 years, devoted father of Thomas Hart (Rachel Coloff) and Dr. John (Laurie) Hart, loving grandfather of Brittany, Victoria and Mason Hart; brother of Stella (Hartocollis) Nickolopolous, the late Effie (Hartocollis) Soter and Dr. Peter Hartocollis, also survived by nieces and nephews. William was a proud man, guided by his everlasting faith. He was an active member of AHEPA (American Hellenic Educational Progressive Association), Treasurer and board member of Holy Cross Greek Orthodox Church. William will be greatly missed and loved forever.