Matt Guillory (born 1974) is an American musician. He mainly plays keyboards and tends to write progressive metal. He has often been compared to the Swedish keyboard player Jens Johansson, famous for his work in the power metal band Stratovarius. Matt Guillory has worked for Mike Varney, appearing on several mid 90s records as session player. Guillory currently works with Dream Theater's vocalist James LaBrie, writing and co-writing songs on the singer's solo releases.