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."
So You Think You Could Dance
At the age of 18, Mason competed on the fifth season of the show So You Think You Can Dance, becoming the youngest winner in the history of the competition over fellow contestants Brandon Bryant, Kayla Radomski, and Evan Kasprzak. For the first five weeks of the competition (Top 20 to Top 12), Mason was partnered with Phillip Chbeeb. During the show's sixth week (Top 10), Mason danced a contemporary number choreographed by Travis Wall and was partnered with Jason Glover. Later, Mason was also partnered with Brandon Bryant, Ade Obayomi, Evan Kasprzak, and Kayla Radomski. Mason was consistently praised for her strong and versatile performances.
During the fall of 2009, Mason toured the United States with the top twelve dancers of the So You Think You Can Dance competition.
Shortly after completing So You Think You Can Dance, Mason turned her full attention to channeling her performing skills into her other lifelong love, the craft of acting. Her on-screen career began when Mason starred in the Halloween episode of Nickelodeon's hit show, Big Time Rush. From there, she appeared in The Bling Ring, CSI: Crime Scene Investigation, The Fresh Beat Band, and Hollywood Heights before landing the recurring role of Cozzette on ABC Family’s Bunheads and leading roles in Hot Mess, and Delirium. She has also booked roles on Major Crimes and Secret Life of the American Teenager as well as several smaller, independent projects. Currently, Mason has a recurring role on ABC's hit medical drama Grey's Anatomy as Dr. Sam Bello.
In February 2018, it was announced that she joined the pilot of Roswell, New Mexico as Liz Ortecho. The CW ordered the show to series on May 11, 2018.
- On February 16, 2018, Mason received a congratulatory tweet on her casting in the The CW series from Shiri Appleby, who also portrayed Liz Parker in the 1999 drama entitled Roswell.
- Mason will take the last name is Ortecho formerly Parker.