Lucille studied Mathematics and Physics at École Polytechnique and managed missile tests for the French armed forces.  After discovering the writings of J. Krishnamurti , he gave up his defense activities in order to pursue a spiritual conquest and would become a guru. 
Francis’ teachings are traditional and have been passed down from generation to generation by a lineage of sages. He met Guru Jean Klein in 1975 who taught in the tradition of Advaita Vedanta ( non-duality ).  Francis' relationship with his as a friend and spiritual apprentice lasted until Klein's death in 1998. Klein's own guru, "Panditji" Rao, whom he met in India in the 1950s, was a college professor in Bangalore, India who taught Sanskrit and belonged to a lineage of traditional Advaita Vedanta teachers. 
Francis’ teachings reflect those of his guru: appreciation for humor, art, music, and poetry, intellectual rigor with a personal twist from to his education in Mathematics and Physics.  He transmits the ancient teaching of nonduality and threads the common ground that Advaita Vedanta , Ch'an Buddhism , Zen , Taoism and Sufism all share.  Many contemporary spiritual teachers have attended his teaching events.  Francis' list of friends included Robert Linssen , Wolter Keers, Yvan Amar, Douglas Harding , William Samuel and Robert Adams. His other influences were J. Krishnamurti , Krishna Menon and Wei Wu Wei whom he knew personally.