This is an audio recording of a talk given by Professor Roger Bowley of the School of Physics and Astronomy, at the Djanogly Theatre, Nottingham Lakeside Arts, on Tuesday October 21st 2014. The talk was in conjunction with the exhibition 'George Green: Nottingham's Magnificent Mathematician', curated by Manuscripts and Special Collections at The University of Nottingham. In the talk, Roger Bowley explains the mathematics used by George Green in his 1828 Essay on the Application of Mathematical Analysis to the Theories of Electricity and Magnetism, and relates Green's work to the work carried out at The University of Nottingham in the 1970s and 1980s by Sir Peter Mansfield and his team to invent Magnetic Resonance Imaging (MRI) scanners.