Dr. Hayashi created a large body of fine art "panoramic photo-collage" or photo collage involving shots taken on a tripod in successive rings, and later assembled as a more-or-less than 360 degree view. Of the over 200 pieces she created in this format, primary subject matter generally fit into the following series: WWII internment camps of Americans of Japanese ancestry, post-industrial landscapes, EPA Superfund sites, abandoned prisons, war and military sites, commissions, city works, and sacred architectures. In 2004, she launched Masumimuseum.com, which is now an online archive of her work.
Hayashi grew up in the Watts neighborhood of Los Angeles, California and graduated from Jordan High School. As an adolescent, she worked at her parents’ store, Village Market, on Compton Avenue. She attended UCLA and later went on to attend Florida State University in Tallahassee, where she earned a Bachelor's degree in 1975 and Master of Fine Arts degree in 1977.
Hayashi joined the faculty of Cleveland State University as Assistant Professor of Photography in 1982, and became a full professor in 1996. During her tenure at CSU, she received numerous awards, including an Arts Midwest, NEA fellowship in 1987, a Civil Liberties Educational Fund research fellowship in 1997, a Fulbright Grant in 2003, and Individual Artist Fellowships from the Ohio Arts Council on three different occasions. She was awarded the Cleveland Arts Prize for Visual Arts in 1994.