Douglas Alexander Smith (born June 22, 1985) is a Canadian actor known for his work on the HBO series Big Love as Ben Henrickson. His other work includes Percy Jackson: Sea of Monsters (2013), Terminator Genisys (2015), Vinyl, Miss Sloane (both 2016), When We Rise (2017), The Alienist (2018–2020) and the second season of HBO's Big Little Lies (2019). (Via Wikipedia)