- "Funny thing about livin' in the city of tomorrow, everybody takes it for granted."
- ―Felix Birnbaum[src]
Felix Birnbaum is an employee at Rapture Central Computing. He is heard in an Audio Diary complaining about Rapture's citizens being ungrateful. Ironically, a former colleague of his claimed that Felix ripped him off by taking all the credit for their project, who repaid the favor by putting Felix's new office key in a Circus of Values vending machine. In the Operations level of Minerva's Den, his key can be bought for $250, and will give access to his office.