season 2, episode 7
Birkhoff was heard but not seen in the episode, by this awesome email:
New Email - Hey Nikki!
Sender - S.Birkhoff
Just totally hacked the SEC database, took me no time at all!
Those chumps really gotta update their firewall, it was some outdated stone age tech they got running…Found some interesting stuff about a company called TransWorld Consortium check it out;sending the decrypted schematics with this message.