John Green studied at the Centre for Psychological Astrology (CPA) in London, qualifying with the Diploma in Psychological Astrology, and became a CPA tutor teaching the online Foundation Course. He is a Fellow of the Association of Professional Astrologers International (F.A.P.A.I.) and a member of the Astrological Association of Great Britain. In 2015 he founded MISPA (Mercury Internet School of Psychological Astrology), an online school offering Diploma-level training in psychological astrology worldwide, built directly on the CPA lineage of Liz Greene and Howard Sasportas. He served as editor of The Astrological Journal from 2008 to 2013. He is the author of Do You Love Me? The Astrology of Relationships and contributed a chapter to Astrology: The New Generation (Flare Publications). He was featured on The Astrology Podcast with Chris Brennan (Episode 210, 2019) and continues to teach courses through MISPA and the CPA.