[2] He moved to Australia in 1978 and began teaching at the University of Sydney in what is now the Faculty of Education and Social Work.
[3] He taught for more than 30 years before retiring in 2009 while remaining the Ashley Montagu Fellow for the Public Understanding of Human Sciences.
Besides books, Juan has been a regular columnist for The Sydney Morning Herald, The Sun-Herald, The Daily News, The Register, and The National Post.
Juan has appeared on numerous television and radio programs explaining and answering questions about the human body, brain, and personality.
To date, he has appeared more than 2000 times on various Australian Broadcasting Commission (ABC) television and radio programs.