Leslie O has studied at or trained with: Lee Strasberg Theatre & Film Institute, Andy Roth, Masters Program with Voices for All, Everett Oliver, Bruce Kronenberg, Abacus Entertainment, Ted Brunetti, and the late, great, Wynn Handman.

She won a SOVAS Voice Arts Award for Outstanding Promo-Best Voiceover and narrated the Emmy-nominated documentary, "UNMARKED." Leslie has been a returning presenter at the SOVAS Voice Arts Awards and covered "That's Voiceover!" Career Expo for LOVStudios. 

In addition to being a voice talent, she offers individual training & group workshops, teleprompter and presentation coaching and incorporates voiceover into her youth programs as a Teaching Artist (House of Art by Mizz Leslie).