Lenk has appeared in episodes of Buffy the Vampire Slayer (27 episodes), Angel, NBC's Joey, House, Six Feet Under, Eli Stone and How I Met Your Mother.

He had small parts in the films Date Movie, The Number 23, and Transformers.
Lenk appeared in the web series Border Patrol, which premiered in June 2008 on Atom.com.
In 2009 Lenk appeared as a guest star on Nip/Tuck.

Besides acting, Lenk is a singer and playwright.
He has toured with the European cast of Grease and has written three plays.
Lenk took over the role of Franz in the Broadway musical Rock of Ages as of September 14, 2009, having originated the role in the Las Vegas and Los Angeles productions in 2006.
From 2009 to 2010, Lenk posted video blogs of himself on YouTube summing up his experiences on Broadway, usually under the title "Tom's Broadway Blogs".
Lenk also participates in video content with Felicia Day's YouTube channel Geek and Sundry and parodies fashion on Instagram.

Lenk appeared in an episode of Psych that poked fun at Buffy the Vampire Slayer (original Buffy actress Kristy Swanson appears in the episode as well).
He performed in the June 2012 edition of Don't Tell My Mother!,
a monthly showcase in which authors, screenwriters, actors and comedians share true stories they would never want their mothers to know.

In 2013, Lenk joined the Lifetime series Witches of East End as Hudson Rafferty.
In 2016, Lenk appeared in the third season finale of Transparent.
In 2018 he starred in Tilda Swinton Answers an Ad on Craigslist which has played in LA, Edinburgh, and London.
Lenk has appeared in episodes of Buffy the Vampire Slayer (27 episodes), Angel, NBC's Joey, House, Six Feet Under, Eli Stone and How I Met Your Mother.
He had small parts in the films Date Movie, The Number 23, and Transformers. Lenk appeared in the web series Border Patrol, which premiered in June 2008 on Atom.com. In 2009 Lenk appeared as a guest star on Nip/Tuck.
Besides acting, Lenk is a singer and playwright. He has toured with the European cast of Grease and has written three plays. Lenk took over the role of Franz in the Broadway musical Rock of Ages as of September 14, 2009, having originated the role in the Las Vegas and Los Angeles productions in 2006. From 2009 to 2010, Lenk posted video blogs of himself on YouTube summing up his experiences on Broadway, usually under the title "Tom's Broadway Blogs". Lenk also participates in video content with Felicia Day's YouTube channel Geek and Sundry and parodies fashion on Instagram.
Lenk appeared in an episode of Psych that poked fun at Buffy the Vampire Slayer (original Buffy actress Kristy Swanson appears in the episode as well). He performed in the June 2012 edition of Don't Tell My Mother!, a monthly showcase in which authors, screenwriters, actors and comedians share true stories they would never want their mothers to know.
In 2013, Lenk joined the Lifetime series Witches of East End as Hudson Rafferty. In 2016, Lenk appeared in the third season finale of Transparent. In 2018 he starred in Tilda Swinton Answers an Ad on Craigslist which has played in LA, Edinburgh, and London.
Tom Lenk