Exhibit 99.1

  Tower Group, Inc. Appoints Senior Vice President & Chief Underwriting Officer

    NEW YORK--(BUSINESS WIRE)--June 2, 2005--Tower Group, Inc.
(NASDAQ:TWGP) today announced the appointment of Gary S. Maier as
Senior Vice President & Chief Underwriting Officer, who will report to
Michael H. Lee, Tower Group, Inc.'s President & Chief Executive
Officer.
    Mr. Maier's primary responsibilities will be to manage Tower's
corporate underwriting department that is responsible for the overall
management and development of products for all lines of business.
"Gary is an important addition to Tower's management team," commented
Michael H. Lee, President & Chief Executive Officer of Tower Group,
Inc. "Gary is an accomplished insurance executive, who will help us
continue to build on our underwriting platform as we expand
territorially and begin actively pursuing program opportunities. He
will provide our business units with an additional senior level
corporate underwriting resource to develop and implement our
underwriting strategies and guidelines."
    With 18 years of experience in the insurance industry, Mr. Maier
most recently served as Senior Vice President & Chief Underwriting
Officer of OneBeacon Insurance Group in New York. In his role at
OneBeacon Insurance Group, Mr. Maier managed the New York and New
Jersey territories. Prior to that, Mr. Maier served as Senior Vice
President & Chief Underwriting Officer of Commercial Lines for Chubb
Insurance Group's Mid-Atlantic Region in which he managed a $400
million middle-market commercial portfolio in seven states with six
field offices and a regional small commercial underwriting center.

    About Tower Group, Inc.

    Tower Group, Inc., headquartered in New York City, offers property
and casualty insurance products and services through its insurance
company and insurance service subsidiaries. Its insurance company
subsidiary, Tower Insurance Company of New York, is rated A-
(Excellent) by A.M. Best Company and offers commercial insurance
products to small to medium-size businesses and personal insurance
products to individuals. Its insurance services subsidiary, Tower Risk
Management, acts as a managing general agency, adjusts claims and
negotiates reinsurance terms on behalf of other insurance companies.
In March 2005, Tower Group, Inc. acquired its other insurance company
subsidiary, Tower National Insurance Company (f/k/a North American
Lumber Insurance Company).

    Cautionary Note Regarding Forward-Looking Statements

    The Private Securities Litigation Reform Act of 1995 provides a
"safe harbor" for forward-looking statements. This release or any
other written or oral statements made by or on behalf of the Company
may include forward-looking statements that reflect the Company's
current views with respect to future events and financial performance.
All statements other than statements of historical fact included in
this release are forward-looking statements. Forward-looking
statements can generally be identified by the use of forward-looking
terminology such as "may," "will," "plan," "expect," "intend,"
"estimate," "anticipate," "believe" or "continue" or their negative or
variations or similar terminology. All forward-looking statements
address matters that involve risks and uncertainties. Accordingly,
there are or will be important factors that could cause our actual
results to differ materially from those indicated in these statements.
We believe that these factors include but are not limited to
ineffectiveness or obsolescence of our business strategy due to
changes in current or future market conditions; increased competition
on the basis of pricing, capacity, coverage terms or other factors;
greater frequency or severity of claims and loss activity, including
as a result of natural or man-made catastrophic events, than our
underwriting, reserving or investment practices anticipate based on
historical experience or industry data; the effects of acts of
terrorism or war; developments in the world's financial and capital
markets that adversely affect the performance of our investments;
changes in regulations or laws applicable to us, our subsidiaries,
brokers or customers; acceptance of our products and services,
including new products and services; changes in the availability, cost
or quality of reinsurance and failure of our reinsurers to pay claims
timely or at all; decreased demand for our insurance or reinsurance
products; loss of the services of any of our executive officers or
other key personnel; the effects of mergers, acquisitions and
divestitures; changes in rating agency policies or practices; changes
in legal theories of liability under our insurance policies; changes
in accounting policies or practices; and changes in general economic
conditions, including inflation and other factors. Forward-looking
statements speak only as of the date on which they are made, and the
Company undertakes no obligation to update publicly or revise any
forward-looking statement, whether as a result of new information,
future developments or otherwise.
    For more information visit Tower's website at
http://www.twrgrp.com/.


    CONTACT: Tower Group, Inc.
             Investor Relations:
             Andrew Colannino, 212-655-2107
             acolannino@twrgrp.com