David Leviton has joined Jones Lang LaSalle as managing director and market leader of its Long Island office. In his new role, Leviton will be responsible with expanding market share on Long Island and overseeing the firm’s agency leasing and tenant representation business. Prior to joining JLL, Leviton served for six years as senior vice president with a major commercial brokerage on Long Island. Earlier, he spent 20 years with another major commercial brokerage on Long Island. He holds a bachelor’s degree from SUNY at Stony Brook and is a member of the Board of Directors of the Commercial-Industrial Brokers Society of Long Island.