Thatcher Lyman graduated from the Oberlin Conservatory of Music with a Bachelor of Music degree in Organ Performance in 2005. He also received a Bachelor of Arts degree in Mathematics from Oberlin College. While there, Thatcher studied organ with Haskell Thomson and James David Christie. He has played in master classes for Daniel Roth, Jean Pierre LeGuay, Marie-Louise Langlais, Lionel Rogg, and Jon Laukvik, and his former teachers include Angela Salcedo and Lucinda Mosher. He won First Prizes in both the Cleveland Chapter and Region V levels of the AGO Regional Competition for Young Organists in 2005. In 2009, Thatcher received Eastman's Gerald Barnes Award for Excellence in Pipe Organ. He was also a finalist for the 2010 John R. Rodland Memorial Scholarship. He is a finalist in the 2012 NYACOP Competition, to be held on Sunday, July 1 at Christ Church Cathedral in Nashville, TN.

An early music enthusiast, Thatcher is a founding member of the five-voice ensemble Uncloistered, which has performed concerts in Cleveland, Iowa City, and Oberlin. In October of 2005, Uncloistered traveled to England together to study with John Potter, formerly of the Hilliard Ensemble, and Anna Maria Friman, of Trio Medieval. While there, Thatcher joined the choir of York Minster as a paid Alto Choral Scholar. He received a Master of Arts degree in Ensemble Singing with distinction from the University of York, UK.

Thatcher received his Master of Music degree in 2008 from the Eastman School of Music, where he is continuing studies in the doctoral program with Hans Davidsson. He is Director of Music at St. Mary's Church in Rochester, NY and is Assistant Director of the Schola Cantorum of Christ Church, Rochester, NY.