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Andy Hertzfeld did the Circles editor in Google+. The site-wide redesign is done by Google Creative Labs, which I think is behind the Search On advertisement series and the Parisian Love Superbowl ad. It's also had significant input and direction from the individual teams, eg. most of the Search UX team was involved in the websearch portion of the redesign.

You're right, I apologize for the inaccuracy. Here's Hertzfeld himself on the subject: https://plus.google.com/117840649766034848455/posts/FddaP6je...

That's not exactly correct. According to the article Hertzfeld was the key interface designer behind the Circles UI in Google+. The Google-wide visual redesign is the result of a lot of people's work.

beat me to the link by a few seconds :)