Swedish goaltender who received the Jack A. Butterfield Trophy as the AHL's MVP with the Binghamton Senators before making his NHL debut with the Ottawa Senators in 2011. He was traded to the Buffalo Sabres in 2015; he then briefly played for the New York Islanders before signing with the Chicago Blackhawks in July 2019.
He played soccer in his early childhood and switched to hockey at age 10. He got his start playing for Frolunda in his native Sweden in 2007.
In international hockey, he has represented Sweden at tournaments like the 2009 IHFF World Under-20 Championship, where he brought home silver. The design of his mask is influenced by the Swedish death metal band In Flames, of whom he is a huge fan.
He married a woman named Donya. His parents are Michael and Veronica Lehner.
He has been teammates with Canadian centre Kyle Turris in Ottawa.