William King was named senior managing director and head of securitized products at hedge fund Citadel Investment Group. He will take over the new post in August and will be based in New York, said Katie Spring, managing director, communications. Mr. Kings appointment will put Citadel in the very best position to identify opportunities today and in the future, said Kenneth C. Griffin, president and CEO, in a news release. Mr. King was managing director and global co-head of securitized products at JPMorgan Securities. Michael Nierenberg, managing director and co-head of securitized products, will assume sole oversight of the securitized products business, said Brian Marchiony, a JPMorgan spokesman.