Hamlin appeared on the NBC legal drama series L.A. Law, playing attorney Michael Kuzak. He remained on the series from 1986 to 1991 during which time he was voted People magazine's "Sexiest Man Alive" in 1987.[10] Hamlin left the series at the end of the fifth season having been nominated three times for Best Actor in a Television Series - Drama by the Hollywood Foreign Press Association.[11]
In early 1991 Hamlin appeared in the music video and sang in the choir on the song "Voices That Care" which was made in support of U.S. troops who were stationed in the Middle East and involved in Operation Desert Storm.[12] He then appeared in two 1992 episodes of Batman: The Animated Series, in each episode as a separate character. In the episode "Joker's Wild", Hamlin played the role of Cameron Kaiser, a ruthless businessman who sinks all his money into a casino, then counts on the Joker to destroy it in order to collect on the insurance policy from a reputable company, and in the other episode, "Moon of the Wolf", he provided the voice of Anthony Romulus, a greedy athlete who takes a potion to enhance his skills, only to realize too late that it has transformed him into a werewolf. In 1995, he participated in the documentary film, The Celluloid Closet where he discussed his role in the film Making Love.[13]
In 2001, he starred in the television comedy Bratty Babies, and in 2002 he reprised the role of Michael Kuzak in an L.A. Law reunion television movie.
In 2004, Hamlin began a recurring role on the television series Veronica Mars.[14] He played fading action hero Aaron Echolls, father to central show character Logan Echolls who had a turbulent relationship with him. Hamlin's character states that he (like the real-life Hamlin) was People magazine's 'Sexiest Man Alive' in 1987.[15][16] Aaron's wife, Lynn, was played by Hamlin's real-life wife, Lisa Rinna. Hamlin appeared beginning in the sixth episode of the first season, "Return of the Kane", and made his last appearance in the second season finale, "Not Pictured". In 2006, Hamlin took part in the third season of Dancing with the Stars with Ashly DelGrosso, but was voted off the show in the third week.[17]
In 2009, Hamlin starred in the series Harper's Island as Uncle Marty. He was killed abruptly in the first episode by being cut in half while he dangled from a broken wooden bridge.
In June 2010, Hamlin guest-starred in an episode of Army Wives and then became a recurring cast member.[18]
In June 2010, Hamlin starred in the Hallmark Channel movie You Lucky Dog.
On December 4, 2008, TV Guide reported that Hamlin and Rinna signed a deal to create a reality television series[19] called Harry Loves Lisa that is based around their family life. The series was developed by TV Land and premiered on October 6, 2010.
In 2012, Hamlin began playing Lloyd Lishman, an older lover to Ian Gallagher (Cameron Monaghan) on the US version of Shameless (7 episodes before the end of Season 3).
Hamlin appeared in an adult diaper commercial with his wife during a primetime television program.[20]
Beginning on April 28, 2013, Hamlin appeared in several episodes of season six (1968) of Mad Men as ad executive Jim Cutler after the merger of Sterling Cooper Draper Pryce and Cutler Gleason and Chaough. Hamlin was nominated for a 2013Primetime Emmy Award for Outstanding Guest Actor in a Drama Series for his appearance in "A Tale of Two Cities".
In 2016, Hamlin was cast in the Epix comedy Graves[21] starring Nick Nolte, and in 2017, Hamlin was cast as Addison Hayes, a mysterious and powerful mastermind whose agenda collides with Swagger, in the USA Network show Shooter.[22]
In 2010, Hamlin authored Full Frontal Nudity: The Making of an Accidental Actor, published by Scribner, wherein he shares stories of his early life before becoming a film actor. (ISBN1-4391-6999-3)[28][29]
Entrepreneurship
Hamlin is an advocate for fusion power[30] and was an angel investor[31] and co-founder of TAE Technologies,[32][33] formerly known as Tri Alpha Energy. TAE Technologies states that it is in the final stages of the research and development of a clean, non-radioactive fusion power generator.[34]
Hamlin delivered a talk on fusion at the TEDX LA conference in 2016 entitled, "You Don't Have To Be a Rocket Scientist To Be a Futurist!"[35] Hamlin was also a board member of Advanced Physics Corporation.[36][37]
Hamlin was president and CEO of the Belle Gray women's clothing boutiques in Los Angeles.[38] Hamlin launched The Lisa Rinna Collection with Lisa Rinna for QVC in 2012.[39]
Hamlin was in a relationship with actress Ursula Andress after meeting on the set of Clash of the Titans in 1979.[41] They had a son, Dimitri Hamlin, in 1980.[42] Although an engagement was announced,[43] the couple never married.[42] In 1983, Hamlin broke up with her.[44]
Since 1997, Hamlin has been married to actress Lisa Rinna, whom he met in 1992. They have two daughters, Delilah (born 1998)[47] and Amelia (born 2001),[48] who both appeared in the reality shows Harry Loves Lisa and The Real Housewives of Beverly Hills with their parents. The couple also starred in the first season of Veronica Mars as Aaron and Lynn Echolls, a married couple. They also starred as a married couple in the 2001 Lifetime movie Sex, Lies & Obsession.