Harry Collins is Distinguished Research Professor at Cardiff University. For over forty years he has been writing on the sociology of gravitational wave physics. A prolific author, his ideas around interactional expertise have been both influential and controversial. In this conversation we explore some of the implications of his work. 

Vis specialises in the diagnosis and treatment of glaucoma, an eye disease where pressure on the optic nerve leads to impaired sight. As a surgeon he performs operations of the utmost delicacy and precision; as a teacher he passes on his wisdom to less experienced surgeons; as a statistical geneticist he researches the scientific basis of eye disease. In this conversation we explore the interplay of these many perspectives across his career.