Frederic A. Nelson will assume the new positions of chief investment officer and vice chairman of ING Investment Management-Americas, Atlanta, on April 7. The firm was formed last year by Dutch conglomerate ING Group to combine all of its investment management businesses in the Americas. Robert Crispin, chairman and CEO, has been filling part of the CIO role. Mr. Nelson will oversee management of about $150 billion in the United States, Canada, Mexico and South America from ING's New York office. Mr. Nelson was managing director and head of U.S. equities at J.P. Morgan Fleming Investment Management, New York. He was replaced by Paul Quinsee, who oversees all U.S. equity portfolio managers, said Alexandra Trower, a spokeswoman.