Management Dynamics, Inc. the market leader in tariff and contract management solutions for the ocean transportation industry, today announced that the company has hired three regional U.S. sales directors to support the company's continued expansion into the shipper, freight forwarder, and Non-vessel operating common carrier (NVOCC) markets. Michael Roberts will be responsible for Rate Explorer® product sales in the Southeast region; Patrick Taylor will lead Management Dynamics' sales operations in the Midwest; and John Christensen will direct the company's Northwest sales program. Management Dynamics President and COO, John Preuninger, said, "We are extremely pleased to add three proven sales executives to the Management Dynamics team.