Marvel Whiteside Parsons, later known as John 'Jack' Parsons, was born in Los Angeles, California, to Marvel Parsons and Ruth Whiteside. His parents were wealthy but separated when Jack was young, impacting his early life.

Parsons enjoyed a relatively privileged upbringing, showing an early fascination with science fiction, particularly the works of Jules Verne and H.G. Wells. These stories fueled his imagination and sparked his initial interest in rocketry.

Parsons' formal education was somewhat limited due to various factors, but he engaged in extensive self-study, particularly in chemistry and rocketry. He conducted amateur experiments, often with volatile results, demonstrating his hands-on approach to learning.

Parsons conducts his first documented rocketry experiment with friend Ed Forman. This involved mixing chemicals and attempting to launch a small rocket.

Parsons attends Pasadena Junior College, studying chemistry and other subjects relevant to his burgeoning interest in rocketry. However, his studies were often interrupted by financial difficulties and his growing focus on practical experimentation.

Parsons withdraws from Pasadena Junior College due to financial constraints and a growing disillusionment with formal academic structures. He increasingly focuses on independent research and experimentation.