Theresa’s  career has spanned almost three decades of performances and recordings with eight-time Grammy Award winner Paul Winter, and she remains a featured artist with Winter's Consort, performing regularly at the world-renowned annual Winter Solstice Celebration and Earth Mass at New York's celebrated Cathedral of Saint John the Divine. Several of these performances have aired on NBC and PBS.

Thomason appeared on Broadway in the musical, Hot Feet, featuring the music of Earth Wind and Fire, directed by Maurice Hines. Returning to the Apollo Theatre in 2012, Thomason performed for the Harlem Jazz Shrines "Jazz al a Carte" with Wycliffe Gordon, Savion Grover, and Maurice Hines.

In 2023, she worked with Dr. Henry Louis Gates Jr. to tour France in a musical presentation of his book "The Black Church." In addition, she is participating in the anniversary celebration this year of WPKN Radio. She has been privileged to work with artists in diverse genres as she continues to tour the U.S., Europe, New Zealand and the Caribbean using her gifts to serve a greater purpose.