Question: Who worked with Lynn Ahrens on Dessa Rose and multiple other musicals including "Lucky Stiff", "Once on This Island", and "My Favorite Year"?
Context: Lynn Ahrens (born October 1, 1948) is an American writer and lyricist for the musical theatre, television and film.  She has collaborated with Stephen Flaherty for many years.  She won the Tony Award, Drama Desk Award, and Outer Critics Circle Award for the Broadway musical "Ragtime".  Together with Flaherty, they have written many musicals, including "Lucky Stiff", "Once on This Island", "My Favorite Year", "Ragtime", "Seussical", "A Man of No Importance", "Dessa Rose", "The Glorious Ones", and most recently seen on Broadway, "Rocky the Musical". A Christmas Carol is a musical with music by Alan Menken, lyrics by Lynn Ahrens, and book by Mike Ockrent and Lynn Ahrens.  The musical is based on Charles Dickens' 1843 novella of the same name.  The show was presented annually at New York City's Paramount Theatre in Madison Square Garden from 1 December 1994 to 27 December 2003. Lainie Kazan (born May 15, 1940) is an American actress and singer.  She was nominated for the 1988 Primetime Emmy Award for Outstanding Guest Actress in a Drama Series for "St. Elsewhere", and the 1993 Tony Award for Best Featured Actress in a Musical for "My Favorite Year".  She had previously received a Golden Globe Award nomination for the film version of "My Favorite Year" (1982).  Her other film appearances include "The Delta Force" (1986), "Harry and the Hendersons" (1987), "Beaches" (1988), "My Big Fat Greek Wedding" (2002) and "My Big Fat Greek Wedding 2" (2016). Dessa Rose is a novel by Sherley Anne Williams published in 1986 (New York: HarperCollins Publishers).  The book is a neo-slave narrative, incorporating many elements of traditional slave narratives.  The book is divided into three sections: "The Darky", "The Wench" and "The Negress".  The sections represent a different stage of growth in the life of the protagonist, Dessa Rose. Stephen Flaherty (born September 18, 1960) is an American composer of musical theatre.  He works most often in collaboration with the lyricist/bookwriter Lynn Ahrens.  They are best known for writing the Broadway musicals "Once on This Island", which was nominated for eight Tony Awards, "Seussical", which was nominated for the Grammy Award, and "Ragtime", which was nominated for twelve Tony Awards and won Best Original Score.  Flaherty was also nominated for two Academy Awards and two Golden Globe Awards with Lynn Ahrens for his songs and song score for the animated film musical "Anastasia". Once on This Island is a one-act musical with a book and lyrics by Lynn Ahrens and music by Stephen Flaherty.  Based on the 1985 novel "My Love, My Love; or, The Peasant Girl" by Rosa Guy, it is set in the French Antilles archipelago in the Caribbean Sea.  The show includes elements of the "Romeo and Juliet" story and elements of the Hans Christian Andersen fairy tale "The Little Mermaid".  It concerns a peasant girl on a tropical island, who uses the power of love to bring together people of different social classes. Dessa Rose is a musical based on the book by Sherley Anne Williams with book and lyrics by Lynn Ahrens and music by Stephen Flaherty.  It tells the story of a young black woman and a young white woman and their journey to acceptance in 1847 in the ante-bellum South, as they tell their story to their grandchildren. Norm Lewis (born June 2, 1963) is an American actor and baritone singer.  He has appeared in Europe, on Broadway, in film, television, recordings and regional theatre.  Productions that he has been involved in include "Dessa Rose", "Miss Saigon", "The Wild Party", and several others. Lucky Stiff is a musical farce.  It was the first collaboration for the team of Lynn Ahrens (book and lyrics) and Stephen Flaherty (music).  The show is based on the 1983 novel "The Man Who Broke the Bank at Monte Carlo" by Michael Butterworth.  It was created and performed at Playwrights Horizons off-Broadway in 1988, and won the Richard Rodgers Award for that year.  The musical was seen in London's West End in 1997 but has not had a Broadway production.  A film version had a limited release in theatres in 2015 but received mostly negative reviews. My Favorite Year is a musical with a book by Joseph Dougherty, music by Stephen Flaherty, and lyrics by Lynn Ahrens.  It is based on the film of the same name.
Answer: Stephen Flaherty