Simcock started exhibiting at London's Piccadilly Gallery from 1957 after encouragement from Arthur Berry and went on to have more than fifty solo shows worldwide.
National Portrait Gallery | National Gallery of Art | National Gallery | National Gallery of Australia | National Portrait Gallery (London) | National Gallery of Victoria | Art Gallery of New South Wales | Night Gallery | National Gallery of Canada | National Portrait Gallery (United States) | Piccadilly | National Portrait Gallery, London | Saatchi Gallery | Art Gallery of South Australia | Walker Art Gallery | Queensland Art Gallery | Tretyakov Gallery | Art Gallery of Western Australia | Hayward Gallery | Yale University Art Gallery | National Gallery of Ireland | St James's Church, Piccadilly | Piccadilly Circus | National Portrait Gallery (United Kingdom) | Freer Gallery of Art | Art Gallery of Ontario | Manchester Piccadilly station | Ikon Gallery | art gallery | Zach Feuer Gallery |