YoHa (English translation 'aftermath') is a partnership between artists Graham Harwood and Matsuko Yokokoji, formed in 1994. YoHa's graphic vision and technical tinkering, has powered several celebrated collaborations, establishing an international reputation for pioneering critical arts projects. Harwood and Yokokoji co-founded the artists group Mongrel (1996-2007) and established the MediaShed a free-media lab (2005-2008). In 2008 they joined Richard Wright to produce Tantalum Memorial shown in nine countries and 15 cities over four years. In 2010 YoHa produced Coal Fired Computers before embarking on a series of works about the lived logics of database machinery including Invisible Airs (2011) and Endless War (2012).
In 2015, YoHa collaborated on Graveyard of Lost Species, with Critical Art Ensemble and Arts Catalyst. YoHa recovered a wrecked cockle boat (a historic 12-ton Thames Bawley) from the Thames Estuary mudflats, and working with local people from Leigh-on-Sea and Southend, are in the process of transforming it into a public monument to record the disappearance of the marine species, wildlife, industries, dialects, traditions and landmarks that were once found along the Thames Estuary.