Mason was born in Miami, Florida, and grew up in a dance-oriented family in Pinecrest, an affluent Miami neighborhood. Both of her parents are of Cuban descent. Mason began her dance training at the age of three in ballet and flamenco, and went on to study jazz, acrobatics, hip-hop, modern, and contemporary dance. Mason began her study of theatre at age 11 with community and middle school productions. Upon moving to Los Angeles, California, Mason continues to study theater while also keeping a focus on film and Television at The Michael Woolson Studio. Jeanine graduated cum laude from UCLA in the Spring of 2014 and accredits the knowledge that she has attained at the school to fueling her creative work. "It’s always interesting to me how my studies mirror my life. Any time I’m learning new academic material, I find a way to use it in my work. And the more material I have to pull from, the richer that work becomes."