The Pennsylvania teen grew up singing but never imagined he'd have enough confidence to sing in front of a crowd, his bio on the show's website says.
"I can't believe you're not signed already," judge Gwen Stefani told Isaiah, 19, who chose Adam Levine as his coach.
Teaneck nurse and cancer survivor Felicia Temple earned herself a spot on Alicia Keys' team earlier this week.
After winning a singing contest for Justin Bieber's movie "Never Say Never," Isaiah realized his true potential to make it in music.
With this new confidence, he began to lose weight and further pursued his passion by creating and recording YouTube covers with friends.
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