Kathleen Sidwell was born in 1946 in Denver, Colorado. She attended the University of Colorado and earned her BA in History, minoring in Philosophy and Education. In the early 80's, she was a student at Southern Methodist University and was a BFA candidate and a Special Student in Sculpture and Printmaking. Continuing her education in 1991, she attended Bershire School of Contemporary Art in North Adams, Massachusetts, studying large scale monotypes, video, and installation art. Kathleen's continuing thirst for knowledge led her to Bellevue Community College, where she received a Certificate in Public Art.

A world traveler, Kathleen has lived in many different parts of the US, including Seattle, New Orleans, Dallas, and now, Brewster. She has also visited quite a few other parts of the world, including China, Japan, Greece, Mexico, Nicaragua, Germany, and Spain.

Kathleen has a unique style all her own. She is known for her dreamlike abstract prints, and her thick, sculptural paintings. Along with making art, she has played a major role in many art communities; She worked on a three year collaborative installation and performance piece in Tacoma, Washington, Video Installations and Public Installations in Houston, Texas, and has taught printmaking courses at the Cape Cod Museum of Art.