Allied World Europe Hires Andy Brooks to Lead International Property Division

PEMBROKE, Bermuda, September 16, 2010 - Allied World Assurance Company Holdings, Ltd (NYSE: AWH) announced today
that Andy Brooks has joined the Allied World Europe team as Manager for the
International Property division. As International Property Manager, Mr.
Brooks will oversee Allied World's non-North American property business on
behalf of Allied World Europe and Lloyd's Syndicate 2232.

John Redmond, President for Allied World Europe, commented, "We are very
excited to have Andy come on board. His reputation and industry expertise
will be invaluable as we look to grow the International Property book of
business."

Prior to joining Allied World, Mr. Brooks was most recently Head of
Insurance at Endurance UK, where he focused on managing the Property,
Construction and Casualty Insurance portfolio, targeted at UK National
accounts and mid-range businesses. He was also responsible for local
reinsurance placement. Prior to Endurance, Mr. Brooks worked at St Paul
International where he was London Underwriting Manager and Head of Outwards
Reinsurance, as well as a member of the UK Executive team. Before St Paul,
Mr. Brooks spent over 22 years at Royal & SunAlliance where he was
Underwriting Manager in commercial and international business. Mr. Brooks is
a Fellow of the Chartered Insurance Institute, a Chartered Insurer, and sits
on a committee of the Insurance Institute of London. Additionally, he is
approved with the FSA.

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, both of Allied World Assurance Company Holdings, Ltd