Answer by taking a quote from the following article:

Alan Irwin Menken was born on July 22, 1949, at French Hospital in New York City, to Judith and Norman Menken. His father was a boogie-woogie piano-playing dentist, and his mother was an actress, dancer and playwright. His family was Jewish. Menken developed an interest in music at an early age, taking piano and violin lessons.

After graduating, Menken's plan was to become either a rock star or a recording artist. His interest in writing musicals increased when he joined the Broadcast Music, Inc. (BMI) Musical Theatre Workshop and was mentored by Lehman Engel. From 1974 to 1978, he showcased various BMI workshop works, such as Midnight, Apartment House (lyric by Muriel Robinson), Conversations with Pierre,Harry the Rat and Messiah on Mott Street (lyrics by David Zippel). According to Menken, during this period, he "worked as a ballet and modern dance accompanist, a musical director for club acts, a jingle writer, arranger, a songwriter for Sesame Street and a vocal coach. He performed his material at clubs like The Ballroom, Reno Sweeny and Tramps." In 1976, John Wilson reported for The New York Times that members of Engel's BMI Workshop began performing as part of the "Broadway at the Ballroom" series: "The opening workshop program ... featured Maury Yeston and Alan Menken, both playing their piano accompaniment and singing songs they have written for potential musicals." Wilson reviewed a performance at the Ballroom in 1977 where Menken accompanied a singer: "In the current cabaret world, a piano accompanist is no longer expected to merely play piano for a singer. More and more, pianists can be heard joining in vocally, harmonizing with the singer, creating a background of shouts and exclamations or even doing brief passages of solo singing."  Menken contributed material to revues like New York's Back in Town, Big Apple Country, The Present Tense (1977), Real Life Funnies (Off-Broadway, 1981), Diamonds (Off-Broadway, 1984), and Personals (Off-Off-Broadway, 1985). His revue Patch, Patch, Patch ran at the West Bank Cafe in New York City in 1979 and featured Chip Zien. The New York Times reviewer, Mel Gussow, wrote: "The title song ... refers to a life's passage. According to Alan Menken ... after age 30 it is a downhill plunge."  Menken wrote several shows that were not produced, including Atina, Evil Queen of the Galaxy (1980), with lyrics by Steve Brown. He also wrote The Thorn with lyrics by Brown, which was commissioned by Divine in 1980. This was a parody of the film The Rose, but they could not raise the money to have it produced. He collaborated with Howard Ashman in an uncompleted musical called Babe (c. 1981), with Tom Eyen in Kicks: The Showgirl Musical (1984), and with David Rogers in The Dream in Royal Street (c. 1981), which was an adaptation of A Midsummer Night's Dream. Menken contributed music for the film The Line (1980), directed by Robert J. Siegel.  Menken finally achieved success as a composer when playwright Howard Ashman chose him and Engel to write the music for his musical adaptation of Kurt Vonnegut's novel God Bless You, Mr. Rosewater. The musical opened in 1979 at the WPA Theater to excellent reviews and modest box office. It transferred after several months to the Off-Broadway Entermedia Theater, where it ran for an additional six weeks.  Menken and Ashman wrote their next musical, Little Shop of Horrors, for a cast of only 9 performers, including a puppeteer. This musical is based on the 1960 black comedy film The Little Shop of Horrors. It opened at WPA Theater in 1982 to warm reviews. It moved to the Orpheum Theatre in the East Village, Manhattan, where it ran for five years. The musical set the box-office record for highest grossing Off-Broadway show of all time. It toured around the world, won theater awards and was adapted as a 1986 musical film starring Rick Moranis that earned Menken and Ashman their first Oscar nomination for the song "Mean Green Mother From Outer Space". For his body of work in musical theatre, he was awarded the BMI Career Achievement Award in 1983.  In 1987, Menken and lyricist David Spencer's adaptation, The Apprenticeship of Duddy Kravitz, based on the 1959 novel of the same name, was produced in Philadelphia. After substantial re-writes, it was produced in 2015 in Montreal. In 1992, the WPA Theatre produced Menken's Weird Romance, also with lyrics by Spencer. Menken's musical based on the Charles Dickens classic A Christmas Carol, with lyrics by Lynn Ahrens and book by Mike Ockrent, debuted at Madison Square Garden's Paramount Theater in 1994. The show proved successful and was an annual New York holiday event.  On the strength of the success of Little Shop of Horrors, Menken and Ashman were hired by Walt Disney Studios to write the music for The Little Mermaid (1989). The challenge was to create an animated musical film of this Hans Christian Andersen fairy tale that could sit alongside the Disney classics Snow White and the Seven Dwarfs and Cinderella. The Little Mermaid opened to critical and commercial success and signaled a new Disney era called the Disney Renaissance. The film gave them their first Oscar win: Best Song for the song "Under the Sea". Menken also won the 1989 Oscar for Best Score.  Menken and Ashman's Beauty and the Beast garnered them three 1991 Oscar nominations for Best Song, winning for its title song. Menken won another Oscar for Best Score. The two were working on Aladdin at the time of Ashman's death in 1991. Subsequently, Menken went to collaborate with Tim Rice to finish the songs for the film. The film won an Oscar in 1992 for Best Song: "A Whole New World". Menken also won the Oscar for Best Score. Menken's live action musical film Newsies, with lyrics by Jack Feldman, was released in 1992. Three more animated musical films followed. Menken collaborated with Stephen Schwartz for Pocahontas, for which the two won two Oscars: Best Song and Best Musical or Comedy Score. In 1996, the same musical team created the songs, and Menken, the score, for The Hunchback of Notre Dame. In 1997, Menken reunited with his early collaborator, David Zippel, for his last animated musical film in the series, Hercules.  Menken also wrote the music for the Michael J. Fox vehicle Life with Mikey (1993), the holiday film Noel (2004) and Mirror Mirror (2012). His other film scores for Disney have included Home on the Range (2004), the Tim Allen remake of The Shaggy Dog (2006), Enchanted (2007) and Tangled (2010). In March 2017, Disney released a live action film adaptation of Beauty and the Beast, with the songs from the 1991 film and new material by Menken and Rice. As of 2017, Menken is collaborating on writing new songs with Pasek and Paul for a live-action film remake of Aladdin and is also working with Lin-Manuel Miranda on new music for a live-action film adaptation of The Little Mermaid.  With eight Academy Awards (four each for best score and best song), only composer Alfred Newman (nine wins) and Walt Disney (22 wins) have received more Oscars than Menken. He is tied for third place with late costume designer Edith Head. He currently holds the record for the most wins for a living person. He was named a Disney Legend in 2001.

How was his work on The Little Mermaid received?
The Little Mermaid opened to critical and commercial success and signaled a new Disney era called the Disney Renaissance.