Tsuneo Hasegawa

Tsuneo Hasegawa (長谷川 恒男) was a Japanese alpinist. His achievements include the winter solo ascent of the "Great North Faces of the Alps" or "North Face Trilogy" (Matterhorn in 1977, second winter solo ascent ever; Eiger in 1978, first winter solo ascent ever; Grandes Jorasses in 1979, also first winter solo ascent ever) and the world's first winter solo ascent of the South Face of Aconcagua in 1981. He died in 1991 in an avalanche while ascending the Ultar II South east face.

Notable achievements

 * 1977 World second winter solo ascent to Matterhorn North face
 * 1978 World first winter solo ascent to Eiger North face
 * 1979 Winter solo ascent to Grandes Jorasses North face
 * 1980 Winter solo ascent to Aconcagua North face Normal Route
 * 1981 World first winter solo ascent to Aconcagua South face France Route