Jonathan Calderwood is a Northern Irish football groundskeeper who specialises in turf management of football pitches. Career In 2013, Calderwood was appointed groundskeeper of French Ligue 1 side PSG. References Expatriate sportspeople from Northern Ireland in France Groundskeepers Living people Aston Villa F.C. non-playing staff Paris Saint-Germain F.C. non-playing staff Wolverhampton Wanderers F.C. non-playing staff