RJ O'Brien & Associates, the independent futures brokerage and clearing firm, has hired Mark Sachs as executive vice president of sales and marketing. Sachs previously served as president of Lind-Waldock, a retail futures brokerage firm acquired by Man Group in 2005. Sachs will work with RJO Futures to create and implement new initiatives for its private client division, which has been servicing accounts that were transferred from MF Global in early November. He will also work on branding and sales strategy.