In the Seinfeld credits, why does it say "Jason Alexander as George" when no one else has as after their name?

For instance, the credits say: Jerry Seinfeld, Julia Louis-Dreyfus, Michael Richards, and Jason Alexander as George. Why doesn't it say "Julia Louis-Dreyfus as Elaine" or "Michael Richards as Kramer?" What makes Jason different? I know that all the cast members had made TV appearances... show more For instance, the credits say: Jerry Seinfeld, Julia Louis-Dreyfus, Michael Richards, and Jason Alexander as George. Why doesn't it say "Julia Louis-Dreyfus as Elaine" or "Michael Richards as Kramer?" What makes Jason different? I know that all the cast members had made TV appearances before, so it's not that Jason was new to the TV genre. I'm a fan and just curious about this.
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