Hon. Leon and Sandy Katz of Philadelphia announce the engagement of her son, Dr. Irving S. Scher, to Dr. Erin Harley, daughter of Dr. and Mrs. John Harley of Seattle.

    Dr. Scher is a graduate of the University of Pennsylvania and the University of California at Berkley.

    Dr. Harley is a graduate of the University of Washington.

    The couple lives in Santa Monica, Calif., where they work for Exponent, Inc., a scientific and engineering consulting firm.

    The couple is planning a summer wedding in Seattle.