One piano player who crosses many genres is Jim Brickman, who often plays his own compositions. Along with smooth jazz stations, Brickman’s music is played on pop, inspirational, and new age stations.
You may be more interested in the rock keyboard players. Some of them have been: Rick Wakeman of Yes, Tony Banks of Genesis, Dennis De Young of Styx, and David Sancious who played for Springsteen, Santana, and Sting. Rock piano players include Elton John, Billy Joel, Carole King, Paul McCartney, and Carly Simon.