Couch Braunsdorf: Pressroom: ONEBEACON PROFESSIONAL PARTNERS, COUCH BRAUNSDORF INSURANCE

NEWS RELEASE
FOR IMMEDIATE RELEASE
Contact: Maggie Sheehan
Phone: 781.332.7271
Email: msheehan@onebeacon.com
ONEBEACON PROFESSIONAL PARTNERS, COUCH BRAUNSDORF INSURANCE
TO HOST PROFESSIONAL LIABILITY RISK MANAGEMENT SEMINARS
CANTON, MA (March 16, 2009) – OneBeacon Professional Partners, a member of
OneBeacon Insurance Group (NYSE:OB), is joining with Couch Braunsdorf Insurance to host
two seminars on the topic of “Minimizing Legal Malpractice Claims: Top Ten Defense Counsel
Pet Peeves.” The first seminar will be held March 25 at the Union League Club in New York
City. It will be followed March 26 with a session at the Baltusrol Golf Club in Springfield, New
Jersey.

Said Paul Ablan, OneBeacon Professional Partners’ senior vice president and managing
director of professional liability, “These seminars are one example of the added risk management
value we provide to our customers. We’re excited to offer them in collaboration with Couch
Braunsdorf, which has served the legal community for more than 75 years.”
Kim Pihlstrom, senior vice president of lawyers’ professional liability at OneBeacon
Professional Partners, will lead a panel of attorneys that includes some of the top defense counsel
in the tri-state area. The objective of the seminars is to provide small to midsize firms with
knowledge and resources to help avoid legal malpractice claims. All attending counsel will
receive continuing legal education credit.

OneBeacon Professional Partners is a member of OneBeacon Insurance Group that
specializes in professional liability solutions for targeted industries including hospitals of all
sizes, physician groups, managed care organizations, long-term care facilities, health care
facilities, media organizations, real estate professionals and lawyers. Additionally, OneBeacon
Professional Partners provides employment practices liability insurance, management liability
and tailored products for complex organizations including health care provider excess insurance
and HMO reinsurance.
About OneBeacon: OneBeacon Insurance Group’s underwriting companies offer a
range of specialty and segmented commercial and personal insurance products sold through
select independent agents, regional and national brokers, and wholesalers. As one of the oldest
property and casualty insurers in the United States, OneBeacon traces its roots to 1831 and the
Potomac Fire Insurance Company. Today, OneBeacon’s specialty insurance businesses are
national in scope, while commercial lines business is produced in select territories throughout the
United States. Personal lines business is concentrated in the Northeastern United States.
OneBeacon’s U.S. headquarters is in Canton, Massachusetts. The company is publicly
traded on the New York Stock Exchange under the symbol “OB”.

Safe Harbor Statement under the Private Securities Litigation Reform Act of 1995
This press release may contain "forward-looking statements" within the meaning of Section 27A of the
Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements, other
than statements of historical facts, included or referenced in this release which address activities,
events or developments which we expect or anticipate will or may
occur in the future are forward-looking statements. The words "will," "believe," "intend," "expect,"
"anticipate," "project," "estimate," "predict" and similar expressions are also intended to identify
forward-looking statements. These forward-looking statements include, among others, statements
with respect to OneBeacon’s:
• changes in adjusted book value per share or return on equity;
• business strategy;
• financial and operating targets or plans;
• incurred loss and loss adjustment expenses and the adequacy of its loss and loss adjustment
expense reserves and related reinsurance;
• projections of revenues, income (or loss), earnings (or loss) per share, dividends, market share or
other financial forecasts;
• expansion and growth of our business and operations; and
• future capital expenditures.
These statements are based on certain assumptions and analyses made by OneBeacon in light of its
experience and perception of historical trends, current conditions and expected future developments,
as well as other factors believed to be appropriate in the circumstances. However, whether actual
results and developments will conform to our expectations and predictions is subject to a number of
risks and uncertainties that could cause actual results to differ materially from expectations, including:
• claims arising from catastrophic events, such as hurricanes, earthquakes, floods or terrorist
attacks;
• recorded loss and loss adjustment expense reserves subsequently proving to have been
inadequate;
• the continued availability and cost of reinsurance coverage;
• the continued availability of capital and financing;
• general economic, market or business conditions;
• business opportunities (or lack thereof) that may be presented to it and pursued;
• competitive forces, including the conduct of other property and casualty insurers and reinsurers;
• changes in domestic or foreign laws or regulations, or their interpretation, applicable to
OneBeacon, its competitors or its clients;
• an economic downturn or other economic conditions adversely affecting its financial position;
• other factors, most of which are beyond OneBeacon’s control; and
• the risks that are described from time to time in OneBeacon’s filings with the Securities and
Exchange Commission, including but not limited to OneBeacon’s Annual Report on the Form 10-K
for the fiscal year ended December 31, 2008 filed February 27, 2009.
Consequently, all of the forward-looking statements made in this press release are qualified by these
cautionary statements, and there can be no assurance that the actual results or developments
anticipated by OneBeacon will be realized or, even if substantially realized, that they will have the
expected consequences to, or effects on, OneBeacon or its business or operations. OneBeacon
assumes no obligation to update publicly any such forward-looking statements, whether as a result of
new information, future events or otherwise.