Initial phone screen with the recruiter, then a phone screen with the hiring manager. Onsite interview with 3 people, then one more phone call with the hiring manager, all over the course of 2 months. One the interviews were complete I worked with the recruiter to assemble a "packet". That is, detailed information on all my prior work and leadership experiences that was submitted to the Google hiring committee along with the interview write-ups.

Had two phone interviews and a onsite interview (was done from a remote Google office using Google+ hangout). The process and interviews were difficult and unusual but clear, informative and logical. it included a sales mock up pitch via the phone which is the hardest stage. You do need to understand the industry and local market and be up to date with related technologies.