Matsuko Yokokoji co-founded the Mongrel group in 1995 with Graham Harwood. She graduated from Kuwazawa Design College in Tokyo in 1983. Two years prior to this she freelanced as a graphic designer and became the art director for Imperial Enterprise Inc. a company specialising in direct marketing, in 1984.
Yokokoji first came to the UK in 1987 to study printmaking and computer graphics at Guildhall University where she first met Harwood (another founder member of Mongrel). From 1991-1995 she worked as a researcher/coordinator for Japanese TV companies. In 1994 Yokokoji worked for Harwood's ‘Rehearsal of Memory' which first showed at Video Positive 94' and later it became a CD-ROM of which the installation travelled to 12 cities and 9 countries. ‘Rehearsal of Memory' is part of The Centre Pompidou's permanent collection.