Harleysville Group Inc. (NASDAQ: HGIC) today announced the appointment of Arne Herenstein as senior vice president and chief information officer (CIO). In this position, he will direct the company’s ongoing information technology strategy, integration and development efforts. He will report to Michael L. Browne, Harleysville Group’s president and chief executive officer. “During the past five years, the accomplishments of our talented IT professionals have resulted in many accolades for our organization because of the way they’ve enhanced our ability to deliver excellent service and offer greater ease of doing business for our policyholders and agents,” said Browne. “I’m confident that Arne’s 35 years of industry experience and his broad IT expertise will prove invaluable as we continue to build upon these enhancements and work to advance our position as a technology leader in the property/casualty insurance industry.” Before coming to Harleysville, Herenstein was vice president of information technology for OneBeacon Insurance. Prior to that, he served in IT leadership roles at CIGNA, PriceWaterhouseCoopers and Royal Insurance. Herenstein has earned a bachelor’s degree from The City College of New York and a master’s in business administration from St. John’s University. Harleysville Insurance is a leading super-regional provider of insurance products and services for small and mid-sized businesses, as well as for individuals, and ranks among the top 70 U.S. property/casualty insurance groups based on net written premiums. As a Trusted Choice ® company partner, Harleysville distributes its products exclusively through a network of independent agents primarily across 32 states. Harleysville is ranked #21 in the most recent InformationWeek 500, the publication’s annual listing of the most innovative information technology organizations in the U.S., and has been included on the list in each of the last five years. Harleysville Mutual Insurance Company owns approximately 54 percent of Harleysville Group Inc. (NASDAQ: HGIC), a publicly traded holding company for eight regional property/casualty insurance companies collectively rated A (Excellent) by A.M. Best Company. Harleysville Group is listed on the NASDAQ Global Select Market, which is comprised of the top third of all NASDAQ member companies and has the highest initial listing standards of any exchange in the world based on financial and liquidity requirements. Further information can be found on the company’s website at www.harleysvillegroup.com. NOTE TO EDITORS: A photograph of Arne Herenstein is available upon request.