Lubrizol Corp. will make several changes to its senior corporate management, effective June 1. Bob Graf, vice president of research and development, will assume the newly created position of vice president of data science and analytics. Julie Edgar will take over Grafs role, and will also serve as chief sustainability officer. The company also named Tesham Gor vice president for corporate strategy and consumer insights. In addition, vice president for engine oils Tom Curtis will be appointed senior vice president and president of Lubrizol Additives, effective Nov. 1. He replaces Dan Sheets, who will retire at the end of this year after 33 years with the Wickliffe, Ohio-based company.