Why? He and Brian Fitzpatrick were the founding engineers for the Chicago office. I worked with them on Google Code back when there was almost no competition in forges and GitHub had just barely become a thing. Search brings enormous value to all kinds of people and Ads makes it all financially viable. There is plenty to be proud of and without those founding engineers in that office Chicago would not have been a part of it and offered gainful employment to many different engineers in that area. He was a fantastic manager and a great director.