David Lynn, a former U.S. Securities and Exchange Commission lawyer, is rejoining Morrison & Foerster as co-chairman of the firm’s global corporate finance group one year after jumping to another firm, MoFo announced Wednesday.

Lynn, based in Washington, D.C., served as chief counsel of the SEC’s division of corporate finance from 2003 to 2007, and then was a partner at Morrison & Foerster from 2008 through April 2017. He left the firm for Jenner & Block to become co-chairman of that firm’s securities practice last April.