W. R. Berkley Corporation has appointed David R. Lockhart as president of Gemini Transportation Underwriters, a Berkley company. Mr. Lockhart succeeded Rocco P. Modafferi, who was named chairman of Gemini.

Mr. Lockhart joined Gemini as a senior vice president in 2014 and was named executive vice president in 2017. He has 30 years of experience in the property-casualty insurance industry in a broad range of domestic and international underwriting products and services. He holds an M.B.A. from Babson College as well as Chartered Property Casualty Underwriter ("CPCU"), Associate in Insurance Accounting and Finance ("AIAF"), Associate in Commercial Underwriting ("ACU") and Associate in Reinsurance ("ARe") designations.

Mr. Modafferi joined Berkley as president of Gemini when it was formed in 2009 and has 40 years of experience in the property-casualty insurance industry.

Commenting on the appointments, W. Robert Berkley, Jr., president and chief executive officer of W. R. Berkley, said, "Under Rocco's expert leadership, Gemini has successfully navigated the complexities of the excess casualty market for the transportation industry, establishing a well run and profitable business. We are fortunate to have a talented executive like Dave on our team with the knowledge and experience at Gemini to lead the company forward. We are grateful to both Rocco and Dave for their contributions to our organization and wish them the greatest success in their new roles."