Grant Baker was raised in Māngere, located in the south of Auckland, New Zealand, with interests in motorsports from a young age.

He attended teachers' college[2] with the intention of earning an education degree but left early to pursue a career in sales.

[3] As a chairman and principal of Auckland-based Business Bakery, Baker played a role in the $211 million takeover of Trilogy International by CITIC Capital.

[4] Following the sale of Trilogy, Baker, along with his business partners, turned their attention to Me Today, an NZX-listed health and skincare company.

[5][6] During the Global Financial Crisis (GFC), Baker's venture capital firm invested in Dorchester Pacific.