ATG's CMO, Cliff Conneighton, to Speak at Red Herring East 2006 Conference

Business Wire, June 26, 2006

Art Technology Group, Inc. (NASDAQ: ARTG):

WHAT: Cliff Conneighton, Chief Marketing Officer for ATG,
            whose licensed and on demand technology powers e-commerce
            sites and corresponding e-marketing and customer service
            for the world's most customer-centric enterprises, will
            participate in a roundtable panel discussion at Red
            Herring East 2006. The panel is entitled "Technology
            Marketing: Challenging the 'Old Way' of Doing Business."

            In addition to Conneighton, Malcolm Frank, SVP, Marketing
            and Strategy for Cognizant, Jeremi Karnell, Founding
            Partner & President of One to One Interactive, and Larry
            Weber, Founder & CEO of the W2 Group will also participate
            on the panel, which will be moderated by Alex Vieux, Chief
            Executive Officer of Red Herring. The speakers will
            provide meaningful, industry-specific comparisons and
            insights on technology marketing.

      WHEN: Red Herring East 2006
            (http://www.herringevents.com/rheast2006)
            June 26-28, 2006
            The Charles Hotel, Cambridge, MA

            The roundtable panel "Technology Marketing: Challenge the
            'Old Way' of Doing Business" will begin at 11:30 am EDT on
            Tuesday, June 27.

       WHO: Cliff Conneighton
            Conneighton is the Chief Marketing Officer at ATG, where
            he is responsible for driving the worldwide development,
            planning and execution of all marketing initiatives for
            the company. He has more than 25 years of experience in
            the software industry, including many high profile
            leadership positions and was a founder and CEO of iCOMS,
            the world's first independent e-commerce service provider.

            As an industry leader in online commerce, marketing and
            service, Conneighton and the company look forward to
            sharing ATG's unique perspective on some of the changing
            dynamics for marketing technology in the current
            environment.

            ATG
            ATG (Art Technology Group, Inc., NASDAQ: ARTG) makes the
            software that the world's most customer-conscious
            companies use to create a more relevant and consistent
            customer experience, throughout the marketing, commerce,
            and service lifecycle, and across the Web, e-mail, call
            center, and mobile channels. Offering an alternative to
            the traditional silo-based approach to customer-facing
            applications, ATG Wisdom(TM) is the company's strategy for
            delivering a seamless, more compelling, and mutually
            valuable experience to each customer and segment. The
            company fulfills this strategy by providing fully
            integrated best-of-breed product suites installed
            on-premise or delivered on-demand. ATG's solutions power
            over 600 major brands, including A&E Networks, Airbus,
            American Airlines, American Eagle Outfitters, Best Buy,
            Boeing, Cingular Wireless, DirecTV, France Telecom,
            Friends Provident, Hewlett-Packard, Hotels.com, Hyatt
            Hotels, HSBC, InterContinental Hotels Group, Kingfisher,
            Louis Vuitton, Merrill Lynch, Neiman Marcus, Philips,
            Procter & Gamble, Symantec, T-Mobile, Target, US Army, US
            Navy, Warner Music, and Wells Fargo. The company is
            headquartered in Cambridge, Massachusetts, with additional
            locations throughout North America, Europe, and Asia. For
            more information about ATG, please visit www.atg.com.