 The seminars featured Richard Dawkins, David Haig, Daniel Dennett, Steven Pinker and Matt Ridley among others.Helena also helped improve much of 'The Selfish Gene' by Richard Dawkins, as told by him in the preface of second edition of the book.Cronin was married to another academic, the late dental epidemiologist Aubrey Sheiham, professor of dental public health at University College London.