Question: Who began his comedy career writing for comedian Dana Carvey, then later starred with Carvey in the 2016 movie The Secret Life of Pets?

Context articles: Heather Morgan
Filmography and awards of Louis C.K.
The Master of Disguise
This Is Spinal Tap
Louis C.K.
The Church Lady
The Secret Life of Pets
First Impressions (2016 TV series)
The Dana Carvey Show
One of the Boys (TV series)

Heather Morgan is an American actress and comedian.
 She was a cast member and writer on "The Dana Carvey Show", writing and performing such notable skits as Jenny and First Ladies as Dogs, the latter being called "one of the two or three funniest things on the show" by writer and producer Robert Smigel.
 Morgan wrote, produced and starred in the movie "Bark!
" which was nominated for a Grand Jury Prize at the 2002 Sundance Film Festival.
 She is an alum of The Groundlings.
American comedian, actor, writer, producer, director, and editor Louis C.K. began his career performing stand-up while simultaneously making short films.
 When he was 17, he directed a comedic short film titled "Trash Day" (1984).
 His third short film, "Ice Cream", won the grand pize at the Aspen Shortsfest in 1993.
 In the same year, he began writing for "Late Night with Conan O'Brien" before leaving the next year.
 His next writing job was on "Late Show with David Letterman" in 1995, and directed a series of shorts for "Howie Mandel's Sunny Skies" on television, followed by acting as head writer for "The Dana Carvey Show" (1997) and a writer on "The Chris Rock Show" (1997–1999).
 He voiced a fictional version of himself on four episodes of "Dr. Katz, Professional Therapist" from 1996 to 2002.
 He directed his first feature, "Tomorrow Night", in 1998, which failed to attract any distributors and was later re-released by C.K. on his website in 2014.
The Master of Disguise is a 2002 American comedy adventure film directed by Perry Andelin Blake in his directorial debut and written by Dana Carvey and Harris Goldberg.
 Starring Carvey, Jennifer Esposito, Harold Gould, James Brolin, and Brent Spiner, the film was produced by Adam Sandler through his Happy Madison production company.
This Is Spinal Tap (stylized as This Is Spın̈al Tap) is a 1984 American rock music mockumentary comedy film directed, co-written, scored by, and starring Rob Reiner, and co-starring Christopher Guest, Michael McKean and Harry Shearer.
 The film portrays the fictional British heavy metal band Spinal Tap.
 The film satirizes the wild personal behavior and musical pretensions of hard rock and heavy metal bands, as well as the hagiographic tendencies of rock documentaries of the time.
 The three main members of Spinal Tap—David St. Hubbins, Derek Smalls and Nigel Tufnel—are played by actors McKean, Shearer, and Guest, respectively.
 The three actors play their musical instruments and speak with mock English accents throughout the movie.
 Reiner appears as Marty Di Bergi, the maker of the documentary.
 Other actors in the movie are Tony Hendra as group manager Ian Faith, and June Chadwick as St. Hubbins' interfering girlfriend Jeanine.
 Actors Paul Shaffer, Fred Willard, Fran Drescher, Bruno Kirby, Howard Hesseman, Ed Begley, Jr., Patrick Macnee, Anjelica Huston, Vicki Blue, Dana Carvey, Billy Crystal and Linnea Quigley all play supporting roles or make cameo appearances in the movie.
Louis C.K. ( ; born Louis Székely; September 12, 1967) is an American comedian, actor, writer, producer, director, and editor.
 "C.K." is a phonetic simplification of his surname.
 C.K. began his career writing for several comedy shows in the 1990s and early 2000s for comedians, including David Letterman, Conan O'Brien, Dana Carvey, and Chris Rock.
 Also in this period, he was directing surreal short films and went on to direct two features—"Tomorrow Night" (1998) and "Pootie Tang" (2001)—before he starred in the short-lived HBO television sitcom "Lucky Louie" in 2006.
Enid Strict, better known as The Church Lady, was a recurring character in a series of sketches on the American television show "Saturday Night Live" from 1986 to 1990, with later appearances in 1996, 2000, 2011, and 2016.
 She also appeared on "The Dana Carvey Show" in March 1996, reading a Top Ten List, "New Titles for Princess Diana."
The Secret Life of Pets is a 2016 American computer-animated comedy film produced by Illumination Entertainment.
 It is directed by Chris Renaud, and co-directed by Yarrow Cheney, and written by Brian Lynch, Cinco Paul and Ken Daurio.
 The film stars Louis C.K., Eric Stonestreet, Kevin Hart, Steve Coogan, Ellie Kemper, Bobby Moynihan, Lake Bell, Dana Carvey, Hannibal Buress, Jenny Slate and Albert Brooks.
First Impressions is an American television game show hosted by Dana Carvey and Freddie Prinze Jr..
 The series premiered on USA Network on May 10, 2016, and concluded on June 14, 2016.
The Dana Carvey Show is an American sketch comedy television show that aired on ABC during the spring of 1996.
 Dana Carvey was the host and principal player on the show while Louis C.K. served as head writer.
One of the Boys is an American television sitcom that aired on NBC from January to April 1982.
 It starred Mickey Rooney, Dana Carvey, Nathan Lane, and Scatman Crothers.
 "TV Guide" ranked it number 24 on its TV Guide's 50 Worst Shows of All Time list in 2002.