Dr. Arthur Grosser is an American actor and Physical Chemistry Professor at McGill University in Montreal. He has starred in many films and voice acted in games such as Assassin's Creed II, Splinter Cell and Far Cry. Grosser portrayed Pope Sixtus IV in the television mini-series Assassin's Creed: Lineage, and also voiced the character of Jacopo de' Pazzi in Assassin's Creed II.