Liza Brock (nee Witt) is an Australian singer, actress and author. She is best known as a member of the chart-topping 90's Australian girl group, "Teen Queens" which achieved 2 Gold Records, two Top Ten Hits, a Debut Album, tours in Australia and South East Asia, along with a TV Pilot named, Teen Queens which was produced by the Australian Logie Award winning producer of E-Street.

She has successfully published her own online Bipolar survivor’s workbook and has contributed to James Withey’s prestigious The Recovery Letters published in the UK and USA.