Los Angeles-based SunAmerica Inc.'s mutual fund subsidiary SunAmerica Asset Management Corp. named Fidelity Investments marketing executive Per Furmark senior vice president for sales and marketing. . . . Chatsworth-based Cohr Inc. named Sandy D. Morford its president and chief operating officer. . . . Pasadena-based Tetra Tech Inc. said it has signed the final agreement to acquire IWA Engineers Inc. for undisclosed terms.