131409
SUPPLEMENT TO THE PROSPECTUS
DATED JULY 12, 1999
MASON STREET FUNDS, INC.
Henry D. Cavanna, Managing Director of J.P. Morgan
Investment, is solely responsible for the Growth and Income
Stock Fund. Mr. Cavanna joined J.P. Morgan in 1971, and is
a senior U.S. equity portfolio manager in the U.S. Equity
and Balanced Accounts Group. He received his B.A. degree
from Boston College and L.L.B. degree from the University of
Pennsylvania. He also has primary responsibility for the
Growth and Income Stock Portfolio of Northwestern Mutual
Series Fund, Inc.
The date of this Prospectus Supplement is November 17, 1999.
