RL&M partner Jim Badenhausen and executive VP Craig Brown are also joining BlackRock in communications roles.

Montgomery is CEO of RL&M while Lerer moved on to co-found the Huffington Post and serve as EVP at AOL Time Warner.
BlackRock has more than $3.6 trillion under management across a variety of holdings. The company merged with Barclays Global Investors in 2009.
A memo from BlackRock CEO Laurence Fink provided to O'Dwyer's said the hires come as the company “continues to enhance the management of our brand and reputation.”
Brown takes a director slot working under Robinson, while Badenhausen serves as managing director and global head of corporate communications. Badenhausen manages media relations and internal communications.