Seán William McLoughlin (born 7 February 1990), better known by his online pseudonym Jacksepticeye (or simply Jack), is an Irish YouTube personality, known primarily for his comedic Let’s Play series and vlogs. As of April 2018, his channel has over 9.2 billion views and over 19 million subscribers, currently ranked the 35th most-subscribed YouTube channel as well as the most-subscribed channel in Ireland.