Investors should probably credit CEO John Fieldly for their massive returns in Celsius Holdings (CELH 4.84%) stock. Under his leadership, the beverage company moved from relative obscurity to one of the most successful energy drink companies.Such benefits have accrued to shareholders, especially those who bought Celsius stock in April 2018 when Fieldly became CEO. Its results show that investing in the right leader can benefit companies and investors alike.The growth of Celsius stockIf one had invested $1,0 ...