The two questions students most often ask me are 1, What's an I/O job like, and 2, How can I pursue an I/O career. Neither of these two questions has an easy answer. I/O is a complex field and jobs tend to be quite varied in both nature of work and setting. To be an I/O psychologist, you must have a graduate degree in the field, but getting accepted in a graduate program is difficult, requiring extensive undergraduate preparation (yes your undergraduate experience is very important). Consult the documents below for detailed answers.
What is an I/O job like?
How do I pursue an I/O career?
What happens after I apply: Some etiquette
Getting the most out of graduate training
I/O Psychology, Frequently Asked Questions: I/O FAQ
Paul E. Spector, Last modified September 30, 2018.