Career
Den Hartog earned a total number of 109 caps, scoring seventeen goals, in the years 1979-1985. After his hockey career he started working for the Royal Dutch Field Hockey Federation.
Den Hartog earned a total number of 109 caps, scoring seventeen goals, in the years 1979-1985. After his hockey career he started working for the Royal Dutch Field Hockey Federation.
He was a member of the Dutch National Team that finished sixth in the 1984 Summer Olympics in Los Los Angeles