Harold Mayne-Nicholls was born in Antofagasta, Chile. Always involved in football, after working as a press photographer, he studied journalism, and later he obtained a MBA in Business Administration.
From 1983 to 1989 he worked as a sports journalist. At that time he published his first book: El Caso Rojas, un engaño mundial telling the world details about the chilean goalkeeper that cut his face at the Maracana Stadium during a qualification game for Italy 1990.
In 1990, he become press officer for Copa America 1991.
Since then he began a career in football administration. After Copa America, he was the administartion football manager at Universidad Catolica; then National Team Administation Manager.
In 1993, at the World Cup draw in Las Vegas he did his first job for FIFA. Since then he did several activities for FIFA. Some of them includes: Media officer at WC 1994 (Boston) & 1998 (Bordeaux). General Coordinator at WC 2002 (Seoul) and WC 2006 (Munich).
Plus that he worked in 3 olympic Games; several youth tournaments; gave course & lectures in near 40 countries and in 2001 he was appointed as Development officer for Conmebol.