Born and raised in California, she went to South Korea and joined SM Entertainment after winning Youth Best Selection Competition in February 2004.

After years of training, she debuted as a member of South Korean girl group The Grace in April 2005.

In April 2014, it was reported that she would release an independent track in the summer under new label Mafia Records, but it was delayed due to an unknown reason.

[8] In April 2019, Stephanie joined WK Media after her contract with Mafia Records ended.

[9] Soon afterwards, Stephanie released the digital single "Man on the Dance Floor" on April 18.