Jay McCaslin，Jason Paul McCaslin was born on the 3rd September 1980 in North York, Ontario to father Paul (nicknamed as Porno Paul) and mother Sharon. He has two sisters called Katie and Allison. He was the last member to join the Canadian punk band Sum 41 - he joined in 1999 after Mark Spicoluk (who later went on to play for Avril Lavigne) quit.