Cho Oyu | 1994 W side 'W Corner'

A UK expedition to Cho Oyu in 1994 via W side 'W Corner', led by Jonathan Tinker. Summit reached on 7th June 1994. 4 members recorded.

Expedition Details

Field	Value
ID	1332
Imported	2026-03-06 18:04:49.359634
Expedition ID	CHOY94201
Peak ID	CHOY
Year	1994
Season	2
Host Country	2
Route 1	W side 'W Corner'
Route 2	-
Route 3	-
Route 4	-
Nationality	UK
Leaders	Jonathan Tinker
Sponsor	OTT (Out There Trekking) Sishapangma-Cho Oyu Expedition
Success 1	False
Success 2	False
Success 3	False
Success 4	False
Ascent 1	-
Ascent 2	-
Ascent 3	-
Ascent 4	-
Claimed	False
Disputed	False
Countries	Australia, USA
Approach	-
Basecamp Date	1994-06-01
Summit Date	1994-06-07
Summit Time	-
Summit Days	6
Total Days	13
Termination Date	1994-06-14
Termination Reason	4
Termination Notes	Abandoned at 6800m due to wind & Brennan's painful ribs
High Point (m)	6800
Traverse	False
Ski	False
Paraglide	False
Camps	2
Fixed Rope (m)	15
Total Members	4
Summit Members	0
Member Deaths	0
Total Hired	1
Summit Hired	0
Hired Deaths	0
No Hired	False
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Taken	False
O2 Unknown	False
Other Summits	Climbed Xixabangma (West Smt)
Campsites	BC(01/06,5000m),C1(03/06,5500m),C2(05/06,6700m),xxx(07/06,6800m)
Route Notes	BC at road (ruined barracks) High point on NW Face. Only 5 (4 members, 1 Sherpa) went to Cho Oyu and attempted it in pure alpine-style from BC. Had already been on Xixabangma and all except Michael Brennan had reached its West Summit.
Accidents	Brennan's ribs damaged in minibus, very painful
Achievement	-
Agency	Himalaya Expeditions
Commercial Route	True
Standard Route	True
Primary Route	False
Primary Member	False
Primary Reference	-
Primary ID	-
Checksum	2455240
Year	1994
Summit Success	False
O2 Summary	None
Route (lowercase)	w side 'w corner'

Members

Field	Value
ID	5281
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY94201
Member ID	02
Peak ID	CHOY
Year	1994
Season	2
First Name	Michael John
Last Name	Brennan
Sex	M
Age	0
Birth Date	-
Year of Birth	1958
Calculated Age	35
Citizenship	UK
Status	Climber
Residence	Kendal, Cumbria, England
Occupation	Physician
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	True
Injury Date	-
Injury Time	-
Injury Type	9
Injury Height (m)	0
Death Notes	Ribs hurt in minibus on approach
Member Notes	-
Necrology	-
Summit Bid	1
Summit Term	9
HCN	0
Checksum	2434392
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	michael john brennan
Year of Birth	1958
Year	1994
Age at Expedition	36
Role	Member

Field	Value
ID	5282
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY94201
Member ID	03
Peak ID	CHOY
Year	1994
Season	2
First Name	Brigitte
Last Name	Muir
Sex	F
Age	0
Birth Date	-
Year of Birth	1958
Calculated Age	35
Citizenship	Australia
Status	Climber
Residence	Natimuk, Victoria, Australia
Occupation	Tour operator
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	0
Summit Date 1	-
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	0
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	1
Summit Term	3
HCN	0
Checksum	2434450
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	brigitte muir
Year of Birth	1958
Year	1994
Age at Expedition	36
Role	Member

Field	Value
ID	5283
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY94201
Member ID	04
Peak ID	CHOY
Year	1994
Season	2
First Name	William Earl (Bill)
Last Name	Pierson
Sex	M
Age	0
Birth Date	-
Year of Birth	1967
Calculated Age	26
Citizenship	USA
Status	Climber
Residence	Los Angeles, California
Occupation	Film technician
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	True
Personal High Point (m)	6800
Summit Date 1	1994-06-07
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	1
Summit Term	3
HCN	0
Checksum	2437643
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	william earl (bill) pierson
Year of Birth	1967
Year	1994
Age at Expedition	27
Role	Member

Field	Value
ID	5284
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY94201
Member ID	01
Peak ID	CHOY
Year	1994
Season	2
First Name	Jonathan (Jon)
Last Name	Tinker
Sex	M
Age	0
Birth Date	-
Year of Birth	1959
Calculated Age	35
Citizenship	UK
Status	Leader
Residence	York, N Yorkshire, England
Occupation	Alpinist
Leader	True
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	True
Personal High Point (m)	6800
Summit Date 1	1994-06-07
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	1
Summit Term	3
HCN	0
Checksum	2434649
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	jonathan (jon) tinker
Year of Birth	1959
Year	1994
Age at Expedition	35
Role	Leader

4 recorded members.

Name	Sex	Year of Birth	Citizenship	Status	Residence	Occupation
Michael John Brennan	M	1958	UK	Climber	Kendal, Cumbria, England	Physician	Details Other expeditions
Brigitte Muir	F	1958	Australia	Climber	Natimuk, Victoria, Australia	Tour operator	Details Other expeditions
William Earl (Bill) Pierson	M	1967	USA	Climber	Los Angeles, California	Film technician	Details Other expeditions
Jonathan (Jon) Tinker	M	1959	UK	Leader	York, N Yorkshire, England	Alpinist	Details Other expeditions

References

Field	Value
ID	2994
Imported	2026-03-06 18:06:36.307770
Expedition ID	CHOY94201
Reference ID	01
Year	1994
Type	2
Journal	AAJ
Author	Hawley, Elizabeth
Title	-
Publisher	-
Publication Date	1995
Language	-
Citation	69:304-305 (1995)
Yak 94	-
Notes	-

Field	Value
ID	11885
Imported	2026-03-06 18:06:36.307770
Expedition ID	CHOY94201
Reference ID	02
Year	1994
Type	5
Journal	-
Author	-
Title	http://publications.americanalpineclub.org/articles/12199530403/Asia-Tibet-Cho-Oyu-from-the-North-in-the-Pre-Monsoon
Publisher	-
Publication Date	-
Language	-
Citation	-
Yak 94	-
Notes	-

2 recorded references.

Expedition ID	Journal	Author	Title	Publisher	Citation	Yak 94
CHOY94201	AAJ	Hawley, Elizabeth	-	-	69:304-305 (1995)	-
CHOY94201	-	-	http://publications.americanalpineclub.org/articles/12199530403/Asia-Tibet-Cho-Oyu-from-the-North-in-the-Pre-Monsoon	-	-	-