Allied World Europe Launches Healthcare Division; Appoints Rob Wendin

PEMBROKE, Bermuda, September 27, 2010 - Allied World Assurance Company Holdings, Ltd (NYSE: AWH) announced today
that Allied World Europe has launched a Healthcare division that will focus
on offering healthcare solutions to the London market, throughout the United
Kingdom and the European Union. Rob Wendin joined Allied World Europe as Vice
President and will lead the department. Mr. Wendin will be responsible for
building out the division and developing a comprehensive healthcare product
suite tailored to meet growing needs regionally. He will report to Kirsten
Faria, Senior Vice President for Bermuda and International Healthcare.

Ms. Faria commented, "We are thrilled to launch Allied World Europe's
healthcare department to build on our steadily growing international
healthcare segment. I am confident that Rob's extensive experience on both
the underwriting and brokerage side will be an invaluable asset as we begin
building a strong book of business."

Prior to joining Allied World Europe, Mr. Wendin was most recently
Managing Director for Health and Life Sciences industries at Marsh Europe,
Middle East and Africa. He has over 25 years of insurance industry experience
as both an underwriter and broker within the Healthcare and Life Sciences
industries including medical malpractice, health insurance/reinsurance,
products & clinical trials liability, general & employers liability, and
specialty lines.

About Allied World Assurance Company

Allied World Assurance Company Holdings, Ltd, through its subsidiaries,
is a global provider of innovative property, casualty and specialty insurance
and reinsurance solutions, offering superior client service through a global
network of branches and affiliates. Our insurance and reinsurance
subsidiaries are rated A (Excellent) by A.M. Best Company, and our Lloyd's
Syndicate 2232 is rated A+ (Strong) by Standard & Poor's and Fitch. Please
visit our website at www.awac.com for further information on Allied
World.

Cautionary Statement Regarding Forward-Looking Statements

Any forward-looking statements made in this press release reflect our
current views with respect to future events and financial performance and are
made pursuant to the safe harbor provisions of the Private Securities
Litigation Reform Act of 1995. Such statements involve risks and
uncertainties, which may cause actual results to differ materially from those
set forth in these statements. For example, our forward-looking statements
could be affected by pricing and policy term trends; increased competition;
the impact of acts of terrorism and acts of war; greater frequency or
severity of unpredictable catastrophic events; negative rating agency
actions; the adequacy of our loss reserves; the company or its subsidiaries
becoming subject to significant income taxes in the United States or
elsewhere; changes in regulations or tax laws; changes in the availability,
cost or quality of reinsurance or retrocessional coverage; adverse general
economic conditions; and judicial, legislative, political and other
governmental developments, as well as management's response to these factors,
and other factors identified in our filings with the U.S. Securities and
Exchange Commission. You are cautioned not to place undue reliance on these
forward-looking statements, which speak only as of the date on which they are
made. We are under no obligation (and expressly disclaim any such obligation)
to update or revise any forward-looking statement that may be made from time
to time, whether as a result of new information, future developments or
otherwise.

Media, Faye Cook, VP, Marketing & Communications, +1-441-278-5406, faye.cook at awac.com, or Investors, Keith J. Lennox, Investor Relations Officer, +1-646-794-0750, keith.lennox at awac.com