Thomas Sullivan, former chairman and CEO of RPM International Inc. near Medina, Ohio, has died. He was 83 years old. "He was an exceptional and inspirational figure, and a wonderful father," said Frank Sullivan Jr., who is chairman and CEO of RPM, in a statement. He is Thomas Sullivan's son. "Tom shaped RPM's corporate culture, established its core operating principles, and leaves an unmatched legacy of success, mentorship and guidance that is carried on by our current management team," Frank Sullivan…