For the last 25 years, his work has examined the social dimensions of the management of animal disease, focusing on bovine Tuberculosis in England, Wales and New Zealand.
Dros y 25 mlynedd diwethaf, mae ei waith wedi archwilio dimensiynau cymdeithasol gwaith rheoli clefydau anifeiliaid, gan ganolbwyntio ar dwbercwlosis buchol yng Nghymru, Lloegr a Seland Newydd.