Stewart was born in 1958 and lives on her own in Cambridge, Massachusetts. She has attended Gateway Arts since 1995.
Stewart is Deaf-Blind, and uses her hands to see and hear by communicating in ASL. Stewart enjoys tactile processes which leads to her throwing on the potter’s wheel, weaving on a production loom, and creating jewelry. Additionally, Stewart sews striking designs on fabric creating compelling graphics which are then presented as wall hanging or appliqued to pillows and bags. Ona is a strong advocate for the Deaf-Blind community, often making speeches at the state house, giving lectures to Harvard Medical School students, or helping to train interns from local colleges on the intricacies of working with the Deaf-Blind.
Stewart has exhibited her artwork throughout Massachusetts at the Berenberg Gallery and the Gateway Gallery.