Tenzing Norgay Trainor was born on 4 September 2001[5] in Los Angeles, California[6] to Clark Tulley Trainor and Deki Tenzing Norgay.[7] He is Nepalese and Tibetan by descent.[8] His maternal grandfather is Tenzing Norgay, who, together with Edmund Hillary, was the first to climb Mount Everest.[2][3] He has two younger brothers, Kalden and Yonden, and played football since the age of six.[9][5]
He grew up in Florida where he, at the age of eight, started acting at Paladin Playhouse Theater in Fort Lauderdale theater camp.[3][4] His father forced him into the theater camp so that he could learn how to speak in front of people.[4] After returning to California, he started his acting career with appearances in TV series like Stevie TV.[10][11] His breakthrough came in 2013 in the series Liv and Maddie where he played the recurring role of Parker Rooney, Liv and Maddie's younger brother.[12] In 2014, he made a guest appearance as Parker Rooney in the Jessie crossover episode "Jessie's Aloha Holidays with Parker and Joey", along with Joey Bragg as Joey Rooney.[13] In 2017, Liv and Maddie ended after four years.[14]
In 2018, Trainor was cast as Jimbo, a boy completely lost in modern-day society, in two episodes of the Nickelodeon series Knight Squad.[15] In 2019, he starred in the short comedy film Clueless, for which he won an Independent Shorts Award as Best Child/Young Actor.[16] In the animated feature film Abominable, he voiced the character of Jin who, similar to Tenzing Norgay, climbs Mount Everest to bring back a Yeti to his family.[2] He reprised his role in the animated series Abominable and the Invisible City.[17] In 2022, he appeard as Gavin, a member of "The Afterlifers", in the Netflix series Boo, Bitch with Lana Condor and Zoe Colletti.[18] In 2023, he starred in the single eight-episode series of Freeridge.[19]