Jonnie Fielding is the Director of Bowl of Chalk, a walking tour company he founded in 2011. Time Out has listed Bowl of Chalk as one of ‘the best London walking tours’ for three years in a row. ​ ‘Bowl of Chalk’ is cockney rhyming slang for 'walk'.

Jonnie and his walks have been featured on Radio 4, NTS Radio, The Independent, The Guardian, Time Out London and a host of publications and media outlets internationally.