Born in Miami, Florida, Zachary was a quiet and shy child. At the age of four, he began playing the piano and spent years being classically trained. Inspired by his mother's modeling career coupled with his passion for music, Zachary joined a performing arts summer program where he discovered his love of theater. From there he went on to book various print jobs and commercials which included Disney, Busch Gardens and Universal's Wizarding World of Harry Potter. During his middle school years, Williams continued to embrace the arts. He joined his school's jazz and concert bands and began playing the alto saxophone.