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The third son of Labour politician Donald Anderson, Baron Anderson of Swansea and his missionary wife Dorothy, herself the daughter of Bolivian missionaries, he was raised at his parents' London home in Notting Hill. Anderson was educated at Fox School in Notting Hill and Latymer Upper School in Hammersmith. Taking a gap year in Asia, Anderson says he lived the hippy life and smoked dope. He then undertook a degree in history at Queens' College, University of Cambridge, and then an MA in revolutions at Sussex University. Thereafter he went to Goa, India where he eked a living as a hippy selling trinkets on Goa's beaches.
In 1996, Anderson's older brother Hugh who worked as fund manager with Dutch investment bank ABN Amro arranged an interview for him. In a later interview with Al Jazeera, Anderson mused that at that time, he knew nothing about either finance or the City. Anderson was resultantly employed as a utilities analyst, composing models of publicly listed companies. Within five years, his salary had jumped from £24,000 to £120,000; his first three years of bonuses: £14,000; £55,000 and £140,000. In 1997 he moved to Société Générale, and in 1999 to Commerzbank.
In 2000 Anderson joined Dresdner Kleinwort. He was named top stock-picker two years running, appointed joint team leader of the utilities research team, his team became number two in the utilities sector and Anderson was personally judged the fourth highest-ranked analyst (out of around 100).
A second book Cityboy: 50 Ways to Survive the Crunch was published in November 2008. In 2010 Anderson revealed that he was working on a third book, "Just Business". It is about a man who writes an anonymous column for a London-based newspaper, breaks into his boss’s computer and discovers a major crime.
Works by Anderson
- Geraint Anderson: Cityboy: Beer and Loathing in the Square Mile, Headline Book Publishing, 2008, ISBN 0-7553-4616-5
- Geraint Anderson: "Fifty Ways to Survive the Crunch", Headline Book Publishing, 2008, ISBN 0-7553-1946-X
- Geraint Anderson: "Just Business", Headline Book Publishing, 2011, ISBN 0-7553-8172-6
- Geraint Anderson: "Payback Time", Headline Book Publishing, (Out 21 June 2012), ISBN 0-7553-8175-0
- Fish Finger Sandwich (short film, 2017): 
- Trick or Treat (feature film with Odeon and Vue cinema release in October 2019 in UK) 
- "City Boy interview". thelondonpaper. 2008-06-18. Archived from the original on 2008-06-22. Retrieved 2008-06-18.
- "City Boy - History". thelondonpaper.com. 2008-06-18. Archived from the original on 2008-06-22. Retrieved 2008-06-18.
- "The men who crashed the world - a four part investigation". Al Jazeera. 25 September 2011.
- Sanghera, Sathnam (2008-06-19). "City Boy: so hard to love". The Times. London. Retrieved 2008-06-26.
- Naughton, Philippe (2008-06-18). "Uncovered: Geraint Anderson, Cityboy". The Times. London. Retrieved 2008-06-26.
- "Geraint Anderson Cityboy interview". Retrieved 2010-06-15.
- Interview with Geraint Anderson in Londonlist (http://londonist.com/2010/02/interview_cityboy_scourge_of_the_sq.php)
- Interview with Plain English Campaign (http://www.plainenglish.co.uk/press-office/press-release-archive/did-jargon-cause-the-credit-crunch.html)
- Interview with The Guardian on a Cityboy's working day (https://www.theguardian.com/business/2009/dec/07/banking-bonuses-executive-pay)
- City Boy website
- Eyebrow magazine interview
- Interview with Radio France Internationale in English
- Here is the City News article
- Sky News article
- Times article on Bonuses & Geraint Anderson
- Documentary on Geraint Anderson nominated for an Emmy
- Article in The Sun on bonuses and Geraint Anderson