9. Dan Reicher
Former Director of Climate Change and Energy Initiatives
No. of Entries: 8
Reicher, who left Google early in 2011 for a post at Stanford University, has eight entries on the White House visitors log, including an April 22, 2010, Earth Day reception. Reicher led the early charge on Google's renewable energy initiatives, which now total some $915 million in investments. Among the Google investments that have received ARRA funds are AltaRock Energy, which was awarded $28 million, and SolarCity Corporation, which has been awarded $11.02 million.