Lewis A. Sanders will become CEO of Alliance Capital Management Holding and Alliance Capital Management, New York, effective June 30. Bruce W. Calvert, currently Alliance's chairman and CEO, will remain chairman, according to a company statement. Mr. Sanders is vice chairman and chief investment officer of Alliance Capital Management; he was CEO of Sanford C. Bernstein, which was merged with Alliance in 2000. Mr. Calvert said in a statement that he has viewed Mr. Sanders as his successor. Mr. Sanders will drop the CIO title but keep the duties and will not be replaced, said John Meyers, a spokesman.