At the end of level 23: R&D Lab, you find a poster by the door in the elevator room near Mr. Ozu, which has a picture labeled Brian Youds, Freelance Reporter. Brian Younds was the sound designer of the game.
There are many more images of people hanging around the Nakatomi building, but without names. We suspect however that several of these could also be members of the development team. Here is one example from level 3: The Bomber.
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Egg id: 223
In level 15: The Architect, before entering his office, you also hear the architect refer to himself as "Mike from Forst Architecture", another reference to level designer Mike Forst.
Egg id: 52 There are multiple references to the development team in the game. The most obvious one is of level designer Mike Forst in the kitchen of level 9: Playin' the Hero.