In the 1950s, he wrote two major works on communication theory: Communication: The Social Matrix of Psychiatry (1951, with Gregory Bateson), and Nonverbal Communication (1956, with Weldon Kees).
Laterna Magika is a nonverbal theatre located in Prague.
Malcolm Gladwell's examples include California businessman Tom Gau and news anchor Peter Jennings, and he cites several studies about the persuasive implications of non-verbal cues, including a headphone nod study (conducted by Gary Wells of the University of Alberta and Richard Petty of the University of Missouri) and William S. Condon's cultural microrhythms study.