Training with a local stonemason in Lincolnshire and then with the Orton Trust, Sargeant's career began in earnest as apprentice and then assistant to David Kindersley in Cambridge who raised him in the tradition and spirit of direct carving and the treatment of text as texture. Joining Rattee and Kett Ltd further enhanced his carving skills and knowledge of restoration before a number of projects with Ian Hamilton Finlay prompted a shift in direction culminating in the collaboration with Dhruva Mistry on Victoria Square in Birmingham. He then won the British Council scholarship to the Government School of Sculpture in South India.
Significant commissions have included the Christopher Jones monument at Rotherhithe, brick carving for Suffolk College of Art and Otley College of Agriculture, the copper tree fountain for Essex and Suffolk Water and the Great Court Project at the British Museum. Sargeant has exhibited work at the Fine Art Society, London and has recently been working on designs for a series of Stations of the Cross for Thaxted Church in Essex.