The Brief Roger Bossard, the longtime head groundskeeper for the Chicago White Sox, is entering his 59th season. Bossard comes from a family of groundskeepers with over 230 years of experience in Major League Baseball. He uses special techniques, including charcoal heating and precise infield conditioning, to prepare the field for Opening Day. CHICAGO - For Roger Bossard, head groundskeeper of the Chicago White Sox, Opening Day is the most important day of the year.