Frank Woolworth, president of F. W. Woolworth, Corporation, died in 1919, in Glen Cove, New York. Sum's demeanor made him the perfect candidate to head the F. W. Woolworth Corporation after the death of his brother. He was non-confrontational, as everyone else positioned themselves in the company. The Board of Directors unanimously asked Sum to take on the Presidency. With his infamous modesty he declined. He did, however, agree to take the new role of Chairman. Company Treasurer, Hubert Parson, took the Presidency. Over the following twenty-five years, Sum saw four Presidents come and go. He gave each one quiet-spoken advice and good counsel. As Chairman, he facilitated debate and ensured issues were properly confronted and argued out by the Board.