2014–present: Mainstream success
Park played the recurring character of Minnesota governor Danny Chung on the HBO comedy Veep.
In 2014 Park played a company rep trying to recruit college students in Neighbors. He had previously worked with the director, Nicholas Stoller, on The Five-Year Engagement (2012). Stoller later recommended Park for the role of "a vague North Korean dictator", who later turned out to be North Korean leader Kim Jong-un, in the controversial film, The Interview, directed by Evan Goldberg and Seth Rogen. Impressed by his performance, Goldberg and Rogen offered Park the part just after one audition. As reference material, he looked to Forest Whitaker's performance in The Last King of Scotland and to the Vice documentary on North Korea. Park also gained over 20 pounds for the role.
That same year, Park appeared in the comedy film, Sex Tape.
In 2015 he appeared as Jeff in Netflix's prequel series, Wet Hot American Summer: First Day of Camp and worked on Wong Fu Productions' first feature film, Everything Before Us. Park starred with John Malkovich in the music video for Eminem's single "Phenomenal". He then played a co-worker of Amy Schumer's character in Trainwreck and also had roles in the films, Southpaw (as Jed Wang) and The Night Before as Ethan's Boss.
From 2015 to 2020 Park starred as Louis Huang, patriarch of a Taiwanese American family, alongside Constance Wu in ABC's television show Fresh Off the Boat (based on Eddie Huang's memoir, Fresh Off the Boat: A Memoir), written and produced by Nahnatchka Khan and executive produced by Jake Kasdan. He was the first actor cast on the show, the producers having approached him before the pilot was ordered. Being of Korean heritage, Park initially felt uneasy about portraying a Taiwanese father. However, Huang reassured Park that he was his first choice to play his father. When they were staffing the writer's room, Park recommended Ali Wong for a position. The show ran for six seasons and concluded on February 21, 2020.
In 2016 Park appeared in the film Office Christmas Party as Fred.
In 2017 Park appeared in the comedies, The House as the Wall Street Guy and The Disaster Artist. He also lent his voice talents to the computer-animated film The Lego Ninjago Movie as Chen the Cheerleader.
In 2018 Park had minor roles in both the Marvel Cinematic Universe and DC Extended Universe (DCEU). He played FBI Agent Jimmy Woo in the Marvel Studios film Ant-Man and the Wasp, returning as Woo in the Disney+ series, WandaVision (2021). In the DCEU, he played Dr. Stephen Shin in the film Aquaman.
Park produced and starred in the Netflix original film Always Be My Maybe, directed by Fresh Off the Boat creator Nahnatchka Khan, with Ali Wong. The film was written by Park, Wong, and Michael Golamco. The in-film hip-hop band, Hello Peril, is inspired by Park's '90s hip-hop band, Ill Again. The film was released in select theaters on May 29, 2019, and digitally on Netflix on May 31, 2019.
Park, Golamco, and Hieu Ho launched the Asian American-focused production company, Imminent Collision, and signed a first-look deal with 20th Century Fox Television in October 2019. The name is derived from a play they worked on while they were members of the LCC theater group at UCLA.
In 2022 Park starred in the Netflix comedy series Blockbuster, which aired for one season before being cancelled.
In January 2023, Park's directorial debut, Shortcomings, premiered at the 2023 Sundance Film Festival. The film was released on August 4, 2023, by Sony Pictures Classics.
In November 2024, Park finished the New York City Marathon with a time of 4 hours 16 minutes and 18 seconds.
In March 2025, Park starred in the Netflix miniseries, The Residence, as FBI Special Agent Edwin Park. He has also recurred in the CBS Sherlock Holmes-based series Watson playing arch criminal Moriarty.