William Forsythe's research into ways of engendering and organizing movement has led him to pursue counterpoint, proprioperception, entrainment, and authenticity for organizational principles that also allow improvisation. Artistic director and choreographer of the Ballet Frankfurt and himself trained in ballet, Forsythe shows an appreciation of and often a critical engagement with classical dance, transforming and revitalizing it. When he works collaboratively, Forsythe challenges the traditional distinction between choreographer and dancer, thus questioning hierarchy, authorship, and disciplinary boundaries.