Brennan was a significant figure in Steve Jobs' life, being not only his girlfriend but also the mother of his daughter, Lisa. Their relationship was complex and often strained, particularly due to Jobs' struggles with personal responsibility and family dynamics. Despite these challenges, Brennan played an essential role in shaping Lisa's early life and provided her with the support she needed as a single mother.

Nolan Bushnell, the founder of Atari, influenced Jobs' entrepreneurial mindset. He was a model for Jobs, demonstrating innovative thinking in the tech industry. Jobs’ relationship with his daughter, Lisa Brennan-Jobs, is documented in Walter Isaacson's biography, which reveals insights into Jobs' personality and his journey through fatherhood, showcasing the juxtaposition of his professional successes and personal struggles.