Leslie Marlar graduated from the Planetary Astrologers Institute (PAI) in 1977 and completed Hermetician studies at the Church of Light in 1993. She holds an honours degree in Behavioral Science (Psychology and Anthropology) from Rollins College. She is the founder and organiser of S.T.A.R. Guild (Study and Teaching of Astrology Research), a monthly astrology study group. Since 2014 she has maintained a detailed original research project analysing the astrology of SpaceX Falcon 9 and Starship launches, work that has attracted responses from Grok, Elon Musk's AI tool. She publishes regular monthly newsletters and sun sign columns at lesliemarlar.com covering current planetary events, mundane astrology, and sign-by-sign forecasts, and has written articles on astrology and Shakespeare, the Bible and astrology, and astrological biographies of historical figures. She gives regular local talks at the Spiritualist Church in Melbourne and the Yoga Shakti Mission in Palm Bay.