Jay Rubenstein will join the commodities team of multistrategy hedge fund manager Citadel next year.
He will report to Sebastian Barrack, the firm's head of commodities who oversees investment teams trading energy, agriculture and other commodity products. Mr. Rubenstein will work in the firm's Greenwich, Conn., office, confirmed Megan Ingersoll, a Citadel spokeswoman, in an email.
Mr. Rubenstein's position is new. Ms. Ingersoll said she can't provide further details including his title, role, responsibilities and start date.
Most recently, Mr. Rubenstein was a managing director and global head of commodities trading at Morgan Stanley. In October, Mr. Rubenstein and Nancy King, global head of commodities, both left Morgan Stanley after compliance breaches linked to the unauthorized use of communications tools such as WhatsApp. Two people familiar with the situation said the bank didn’t find any wrongdoing, but using the communication channels was against company policy.
Mark Lake, Morgan Stanley spokesman, declined to comment regarding a replacement for Mr. Rubenstein.
Citadel managed about $35 billion as of Oct. 1.
Bloomberg contributed to this story.