129512
SUPPLEMENT TO THE PROSPECTUS
DATED APRIL 30, 1999
NORTHWESTERN MUTUAL SERIES FUND, INC.
William M. Riegel has replaced Michael J. Kelly as co-
manager of the Growth and Income Stock Portfolio, effective
September 20, 1999. Mr. Riegel, Managing Director of J.P.
Morgan Investment Management, Inc., joined J.P. Morgan in
1979. He is a senior equity portfolio manager in the Equity
and Balanced Accounts Group. Mr. Riegel graduated from
Williams College in 1978 and is a Chartered Financial
Analyst. He also shares primary responsibility for the
Growth and Income Stock Fund of Mason Street Funds, Inc.
The date of this Prospectus Supplement is October 12, 1999.
