Jay Scott Greenspan (born September 23, 1959), known professionally as Jason Alexander, is an American actor and comedian. A Tony Award winner, he played George Costanza in the television series Seinfeld from 1989 to 1998, for which he was nominated for seven consecutive Primetime Emmy Awards and four Golden Globe Awards.
Alexander made his Broadway debut originating the role of Joe in Stephen Sondheim's Merrily We Roll Along in 1981. He remained active on Broadway acting in the musicals The Rink in 1984, Personals in 1985, and the Neil Simon play Broadway Bound in 1986. He then starred in Jerome Robbins' Broadway in 1989, for which he won the Tony Award for Best Actor in a Musical. He appeared in the Los Angeles production of Mel Brooks' The Producers. He was the artistic director of "Reprise! Broadway's Best in Los Angeles", where he has directed musicals.
His film roles include Pretty Woman (1990), The Paper (1994), Love! Valour! Compassion! (1997), The Adventures of Rocky and Bullwinkle (2000), Shallow Hal (2001), and Hachi: A Dog's Tale (2009). He also voiced the gargoyle Hugo in the Disney film The Hunchback of Notre Dame (1996). For his role in Dream On (1994) he was nominated for a Primetime Emmy Award for Outstanding Guest Actor in a Comedy Series. He also acted in Curb Your Enthusiasm (2001, 2009), and The Marvelous Mrs. Maisel (2019). He also voiced the titular character in Duckman (1994–1997).
Source : Wikipedia