David Kenneth Harbour is an American actor. He has played supporting roles in films such as War of the Worlds (2005), Awake (2007), Revolutionary Road (2008), W.E. (2011), Knife Fight (2012), Parkland (2013), A Walk Among the Tombstones (2014), Black Mass (2015), Suicide Squad (2016), Sleepless (2017), and No Sudden Move (2021). He gained global recognition for his portrayal of Jim Hopper in the Netflix science fiction drama series Stranger Things (2016–present), for which he received a Critics' Choice Television Award in 2018, two Emmy Award nominations and a Golden Globe Award nomination. Harbour portrayed the title character in Hellboy (2019), Red Guardian in Black Widow (2021) and the upcoming film Thunderbolts (2024), and Santa Claus in Violent Night (2022).