John (Fritz) Sumner (13 March 1936, in Blackburn – 2004) was the pre-eminent exploratory climber in his chosen domain of Mid Wales, climbing cutting-edge routes on the remote crags and cliff-faces south of southern Snowdonia starting in the mid-1950s.

Books

References

John Sumner obituary, Colin Wells, ''The Independent'', 13 March 2004 English mountain climbers 1936 births 2004 deaths People from Blackburn {{Climbing-bio-stub