His first solo exhibition was at the Wickesham Gallery, New York, in 1969 immediately after graduating from the Royal College. He is known for his paintings based on architectural spaces and his large-scale, intricately detailed cityscape paintings, which include panoramas of Hong Kong, Zürich, Jerusalem, Liverpool and, most recently, his view of London which was completed as part of a residency at the National Gallery,[2] London, in 2010.
Over the past 46 years he has exhibited in galleries and museums across the world, including the Institute of Contemporary Arts, London; the Walker Art Gallery,[3] Liverpool; the Art Institute of Chicago; Kunsthalle Tübingen; and the Museo Thyssen-Bornemisza,[4] Madrid. At the first Venice Architecture Biennale in 1991, Norman Foster portrayed his work solely through Johnson's images, before Johnson's work was included in Foster's installation at the 2012 biennale. His work is part of a travelling exhibition currently touring museum venues in Europe, and the first retrospective exhibition of his paintings was scheduled to open in September 2015 at the Southampton City Museum and Art Gallery.
In 2000, the collector and philanthropist Nasser D. Khalili commissioned a set of five paintings titled "House of Peace", depicting spiritual sites of Jerusalem, intended to promote harmony between Abrahamic religions.[6][7]
As of 2014, Johnson has been exploring the ageing and scarring of architecture and, in tandem, investigating geometry and the sacred embodied in Islamic architecture. A second solo exhibition at Alan Cristea Gallery opened in May 2014.[9]
In October 2015, Johnson collected an honorary fellowship from Wrexham’s Glyndŵr University.[10]
The Liverpool Cityscape comprises 170 hectares of the city, a near bird’s-eye perspective. It encompasses several thousand individual buildings and took Johnson and up to 11 assistants 24,000 person hours to complete it. In making The Liverpool Cityscape, Johnson explored the city, (taking over 3000 reference photographs) considered alternative viewpoints, consulted with architects and historians, as well as the people of Liverpool, and absorbed the city’s distinctive atmosphere. Thousands of detailed drawings were produced before the execution of the painting in minute detail.[11]
During February and March 2008 over 51,000 people came to see Ben work on the painting at the Walker Art Gallery in a specially created studio. A live web-cam showing his residency in the Walker was set up to enable the World to watch the creation of the painting online. The resulting exhibition had over 250,000 visits.
The Liverpool Cityscape is permanently on display in the Skylight Gallery of the new Museum of Liverpool.