The head of Brownstein Hyatt Farber Schreck’s white-collar criminal defense and investigations group has jumped to Brown Rudnick in Washington, the lawyer’s new firm announced Monday.

Stephen Best, who started at Brownstein in 2010, joined Brown Rudnick as a partner in the firm’s white-collar defense and government investigations group. He focuses on anti-corruption matters, including Foreign Corrupt Practices Act and U.S. Securities and Exchange Commission cases.

Best said he left Brownstein on good terms. He noted that he continues to assist the firm with some matters, which he declined to identify.

At Brown Rudnick, Best said he couldn’t pass up the opportunity to work with his longtime friend, Mark Tuohey, chairman of the firm’s white-collar defense and government investigations group. "I couldn’t be happier," Best said.

Best said his primary focus now is the September trial over the SEC’s insider trading allegations against his client, Dallas Mavericks owner Mark Cuban. Following the trial, Best said he will direct his attention to growing his practice.

Best has represented Cuban since the SEC filed its suit in November 2008 in Dallas federal district court. At the time, Best was a co-leader of the white-collar defense and regulatory investigation group at the now-defunct Dewey & LeBoeuf. He came to Dewey predecessor LeBoeuf, Lamb, Greene & MacRae in 2002, going on to represent clients that included White House party crashers Tareq and Michaele Salahi.

"Steve will greatly enhance the depth and strength of our white collar and enforcement practices given his tremendous experience with a wide range of regulatory areas," Tuohey said in a written statement.

Tuohey joined Brown Rudnick in 2010 after leaving Vinson & Elkins after more than a dozen years there. Tuohey said in an interview then that he was looking forward to building a "successful white-collar practice for the firm."