Allied World Schedules Fourth Quarter 2009 Earnings Announcement and Conference Call

PEMBROKE, Bermuda, January 7 - Allied World Assurance Company Holdings, Ltd (NYSE: AWH) today announced
that it will release its financial results for the fourth quarter and for the
year ended December 31, 2009, after the close of market on Thursday, February
11, 2010.

Scott Carmilani, President and Chief Executive Officer, and Joan Dillard,
Chief Financial Officer, will host a conference call on Friday, February 12,
2010, at 8:30 am (Eastern Time) to discuss the fourth quarter and year end
2009 financial results. This call will include a question and answer session.

The conference call can be accessed by dialing +1-866-713-8310 (U.S. and
Canada callers) or +1-617-597-5308 (international callers) and entering the
passcode 11691912 approximately ten minutes prior to the call. A live webcast
of the call will be available online at www.awac.com. A replay of the call
will be available through Friday, February 26, 2010 by dialing +1-888-286-8010
(U.S. and Canada callers) or +1-617-801-6888 (international callers) and
entering the passcode 80525762. In addition, the webcast will remain
available online through Friday, February 26, 2010 at www.awac.com.

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 offices
in Bermuda, Europe, Hong Kong, Singapore and the United States. Our insurance
and reinsurance subsidiaries are rated A (Excellent) by A.M. Best Company.
For further information on Allied World, please visit our website at
www.awac.com.

Media: Faye Cook, Vice President, 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