Mauro Staccioli (Volterra, 1937) is an Italian sculptor After the studies at the Art Institute in Volterra, Staccioli starts teaching and in 1968 arrive in Milan at the Academy of Fine Arts of Brera.
http://virtualglobetrotting.com/map/ring-by-mauro-staccioli/
Located just outside Volterra, I've added a picture I took while staying in town a few years back...