| First Name | Jason |
| Last Name | Alexander |
| Full Name at Birth | Jason Scott Greenspan |
| Age | 52 |
| Date of Birth | September 23, 1959 |
| Birthplace | Newark, New Jersey, USA |
| Height | 6' 1" (185 cm) |
| Build | Average |
| Hair Color | Brown - Dark |
| Star Sign | Virgo |
| Ethnicity | White |
| Nationality | American |
| Occupation | Actor |
| Occupation Category | Actor |
| Claim to Fame | Seinfeld |
Jay Scott Greenspan (born September 23, 1959), better known by his professional name of Jason Alexander, is an American actor, writer, comedian, television director and producer, and singer. He is best known for his role as George Costanza on the television series Seinfeld, appearing in the sitcom from 1989 to 1998. He also has had an active career on the stage, appearing in several Broadway musicals including Jerome Robbins' Broadway in 1989, for which he won the Tony Award as Best Actor in a Musical. He appeared in the Los Angeles production of The Producers with Martin Short. He is the Artistic Director of "Reprise! Broadway's Best in Los Angeles," where he has directed several musicals. Alexander is also an avid poker player.
Selected Jason Alexander film and TV show credits: