Peter Dean is a designer living and working in London [2022].

Among other work, he designs letterpress prints. His prints are produced under the trading name 'Kite'.

One of his prints, Time Travellers Invitation, was created with the approval of physicist Stephen Hawking, meant to be part of a playful time-travel experiment.

The story is documented, with some additional photographs, on Tagline's blog:

http://tagfinearts.blogspot.com/2014/02/peter-dean-time-travellers-invitation.html