Gregg was born in Truro (Cornwall) and brought up in the small village Week St Mary. He still lives and works in the village and has his own studio. He studied at art college and later became interested in glass.
His early glass work was greatly influenced by the colours and effects he found in the deposits of metal ores in the old mine workings he explored as a child. He originally used mineral foils in his coloured glass work.
More recently he has worked with coloured glass powder to create flowing organic lines and develop new textures. He’s developed techniques for working with glass powders that are unique to his process; this creates an unusual textured look in the glass, a process which requires a long time in the kiln and which allows the work to take on its organic form.