Mike's own website: https://copia.is/ (scroll down to sponsorship logos) Copia has also been listed on Google's own public policy transparency website in the past, though it's absent at the moment.

EDIT: This version of the disclosure is still up: https://services.google.com/fh/files/misc/trade_association_...

Note that the Google Public Policy Team's explicit purpose is to influence laws to be favorable to the company. Paying "think tanks", lobbyists, and political action groups is explicitly about avoiding government regulation for Google, as Mike is doing here.