Stephen Guarino (born November 14, 1975) is an American actor and comedian, best known as a cast member on the sketch comedy series "The Big Gay Sketch Show", the films "BearCity" and "", and his recurring role as Derrick in the ABC comedy series "Happy Endings", a character that has since been carried over to the NBC sitcom "Marry Me".
Marry Me is an American sitcom that originally aired on NBC from October 14, 2014 to February 17, 2015.
 The series stars Casey Wilson and Ken Marino and aired Tuesday nights at 9 pm (ET/PT)/8 pm (CT) as part the 2014–15 television season.
 "Marry Me" was created and executive produced by David Caspe with co-executive producers/director Seth Gordon and Jamie Tarses for Sony Pictures Television.
Daniel Bucatinsky (born September 22, 1965) is an American actor, writer and producer, best known for his role as James Novak in the Shonda Rhimes drama series "Scandal", for which he won the Primetime Emmy Award for Outstanding Guest Actor in a Drama Series in 2013.
 In 2014, Bucatinsky starred on NBC's "Marry Me", as well as the newly revived HBO series "The Comeback", which he also executive produces.
Will Horton is a fictional character from the American soap opera "Days of Our Lives", known for an award-winning coming out story, award-winning performances by actor Chandler Massey, and as one half of US daytime drama's first male gay wedding and marriage.
 The character first appeared on November 16, 1995, as a newborn child.
 His mother Sami Brady (Alison Sweeney) acts as if Austin Reed (Austin Peck) is the father so Austin might marry her, and they call the child Will Reed.
 When Sami later realizes that Will must actually be the son of Lucas Roberts (Bryan Dattilo), she tries to prevent others finding out.
 Two years later the truth comes out, and Will, who is renamed Will Roberts, has a "tumultuous upbringing" due to his parents' ever-changing love lives, and their machinations as they fight each other for custody.
 As a child, Will does everything he can to bring his parents together, so they can be a "real family"; whereas his grandma Kate Roberts (Lauren Koslow) schemes to keep his parents apart.
 In 2007, Lucas, now in love with Sami and angry at Kate's interference, changes his and Will's surname to Horton (after Will's paternal grandfather).
John Bunny (September 21, 1863 – April 26, 1915) was an American actor and was one of the first comic stars of the motion picture era.
 Between 1909 and his death in 1915 Bunny was one of the top stars of early silent film, as well as an early example of celebrity.
 At one time he was billed as "the man who makes more than the president".
 His face was insured for $100,000 and his unexpected death made headlines around the world.
 Though quickly forgotten, Bunny paved the way for future plump comedians such as Fatty Arbuckle and Jackie Gleason.
New York, New York is a 1977 American musical drama film directed by Martin Scorsese and written by Mardik Martin and Earl Mac Rauch based on a story by Rauch.
 It is a musical tribute, featuring new songs by John Kander and Fred Ebb as well as jazz standards, to Scorsese's home town of New York City, and stars Robert De Niro and Liza Minnelli as a pair of musicians and lovers.
 The story is "...about a jazz saxophonist (De Niro) and a pop singer (Minnelli) who fall madly in love and marry"; however, the "...saxophonist's outrageously volatile personality places a continual strain on their relationship, and after they have a baby, their marriage crumbles", even as their careers develop on separate paths.
 The film marked the final screen appearance of actor Jack Haley.
Robert Emmett Keane (March 4, 1883 – July 2, 1981) was an American actor of both the stage and screen.
 He was also known professionally by the names: Emmett Keane, Robert Keane, R. Emmett Keane, and Robert E. Keane.
 He began on stage in the 1910s, with his first Broadway appearance being in the 1914 production of "The Passing Show of 1914".
 He would continue on the stage through the mid-1930s, appearing in both London and New York theater productions.
 His film career began in 1930, and over the twenty-five years of that career he would appear in between 170–200 films.
 At the very tail end of his acting life he would make several appearances on the small screen.
 Married twice, the first time would be a short-lived union with Muriel Inetta Window, an opera singer, vaudeville actress and 1913 Peacock Girl with the Ziegfeld Follies.
 They were married in approximately 1916 and divorced in 1920.
 After his divorce, he would marry the actress Claire Whitney in 1921, and they would remain married until her death in 1969.
 He retired in 1958, and would die on July 2, 1981 and be buried in Forest Lawn Memorial Park in Los Angeles, next to his wife, Claire (although her grave is unmarked).
John Gemberling (born February 1, 1981) is an American actor and comedian best known for roles as Bevers on the Comedy Central series "Broad City", as Gil on the NBC sitcom "Marry Me", and as John Hancock on the Fox sitcom "Making History".
 Since April 2017, he has portrayed Steve Bannon on Comedy Central's political satire late night series "The President Show".
Kenneth Joseph "Ken" Marino (born December 19, 1968) is an American actor, comedian, director, and screenwriter.
 He was a cast member on MTV's "The State" and has starred in shows such as "Party Down", "Marry Me", "Burning Love", "Brooklyn Nine-Nine" and "Childrens Hospital".
Brendan Hines (born December 28, 1976) is an American actor and singer-songwriter.
 He was raised in Baltimore, Maryland, where he graduated from Loyola Blakefield.
 His mother was a former nun and his father a former priest who both left Brooklyn and the church to marry and teach philosophy.
 He has had a number of television roles, but is best known for his role as Eli Loker in "Lie to Me".
 He has also had leading roles in a handful of independent films.

Question: which american actor is one of the stars in marry me 
Answer: Ken Marino