Scott Rubner, a Goldman Sachs (NYSE:GS) veteran known for his bold stock market predictions, is joining market maker Citadel Securities' institutional derivatives segment, according to a media report dated Tuesday.

Citadel Securities hired Goldman Sachs Group Inc.’s Scott Rubner, who has turned heads on Wall Street with prescient calls on equities markets, to help go toe-to-toe with banks in catering to hedge funds and other big traders.

Scott Rubner, a managing director in the derivatives sales and macro execution team at Goldman Sachs , has left the investment bank, a source familiar with the matter told Reuters on Monday.

Scott Rubner, Goldman Sachs Group Inc.’s managing director for global markets and tactical specialist, has left the bank after almost a decade at the firm, according to a person familiar with the matter.