Former New York City comptroller Bill Thompson took on Mike Bloomberg in the mayoral race last fall. His consolation prize is a job in the private sector.
The company announced Thompson will be their new chief administrative officer and a senior managing director.
Siebert Brandford Shank did conduct business with the City when Thompson was comptroller, and Thompson says he will not deal with New York City business in his new position.
Thompson has already announced his intent to run for Mayor again in 2013.