In 1910, he worked for
Karlsruher FV. In August 1911, he was appointed as the first full-time manager of
Bayern Munich, however his time at the club was to last only seven months at the Bavarian club and he was dismissed on 6 April 1912. He had however convinced the Bayern board members that a full-time coach was beneficial to the club. He would go on to manage
Stuttgarter Kickers where he won the
Southern German championship during his first season with the club. His second season was curtailed due to the breakout of
World War I. Griffiths was part of the coaching staff for the Belgium national team in 1920 when they won the
Olympic Games Football at the 1920 Summer Olympics football tournament. He managed Dutch club side
Vitesse Arnhem between 1920 and 1922 and Be Quick in the 1922 Championship play-off. In September 1923, he joined
Olympique Lillois. In February 1924, he was appointed as the head coach for the France national team. He won the
Coupe de France in
1933 whilst manager at
Excelsior AC Roubaix. He returned to his former club
Royale Union Saint-Gilloise, and won the league in three consecutive seasons from 1933 to 1935. He retired in February 1936 due to ill health. ==Later life and death==