Question: Which company that mines two key crop nutrients—phosphate and potash did James T. Prokopanko  serve as president and Chief Executive Officer of?
Sentence (from "James T. Prokopanko"): James T. Prokopanko is the former president and Chief Executive Officer of The Mosaic Company and has served in that capacity from January 1, 2007 to August, 2015.
Relevant evidence: Yes