Adam Matthew Nagaitis (/nəˈɡaɪtɪs/;[1] born 7 June 1985) is a British actor best known for his roles as Caulker's Mate Cornelius Hickey in the AMC television series The Terror and firefighter Vasily Ignatenko in the HBO miniseries Chernobyl.

[5] At age 19 he left the UK to study acting at the Stella Adler Conservatory in New York, from which he graduated in 2007.

[8][9] At the age of 14, he began his acting career in 2000 when he played a minor character in the television series Children's Ward.

In 2015, he appeared as Mr. Cummins in the period biographical film Suffragette and as Private Buckley in 7 episodes of the television series Banished.

In 2018, he appeared as Conductor Jimmy in the mystery action film The Commuter, featuring Liam Neeson, Vera Farmiga, Patrick Wilson and Sam Neill.