How could Freud and Rogers have created theories that differ so fundamentally? If Rogers and Freud and changed places (turn of the century Vienna versus mid-20th-century US), would they still have developed the same theories?

Answer 1

To a great extent we are products of our cultures, so switching would probably change their theories. However, critical life events also contributed to their theoretical viewpoints.

Answer 2

Google both of their names for more information.

For example, Goggling "Carl Rogers theory" got me this:

http://www.google.com/search?client=safari&rls=en&q=carl+rogers+theory&ie=UTF-8&oe=UTF-8