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Ceri Peach is a geographer from Bridgend, Wales. He was an undergraduate (BA 1961), graduate student (D. Phil, 1964) and lecturer at Merton College, Oxford  before being appointed to a lectureship in Geography at St Catherine's College, Oxford (known colloquially as St Catz) in 1965 at the age of 26. He held this post jointly with a lectureship at Keble College, Oxford and a Faculty Lectureship at the University of Oxford.
He was elected a tutorial fellow in geography at St Catz in 1969  and also held various non-teaching posts, including several college offices: Domestic Bursar, Senior Tutor, Finance Bursar and Acting Master. During his tenure as Senior Tutor, women were first admitted to the college. As Domestic Bursar, he negotiated college charges with the then Junior Common Room President, Peter Mandelson.
He was Professor of Social geography at the School of Geography and the Environment at Oxford University from 1992 to 2007 and on retirement from his Oxford chair he was appointed Professor of at the Institute for Social Change at Manchester University. In 2007 he was made an emeritus fellow at St Catz.
Time at St Catherine’s College
Ceri Peach found the move from Merton, Oxford’s oldest college, to St Catz, Oxfords newest college, to be liberating:
During his time at St Catz the number of undergraduate geographers accepted by the college increased from 4 each year to between 10 and 12. The University Schools results also became some of the best in the arts subjects at the college. Notable students taught by Ceri Peach include Denis Cosgrove, who went on to become Alexander von Humboldt Professor of Geography at University of California, Los Angeles; Mike Walker and Geoff Duller, who went on to become professors of geography at the University of Wales; Mike Summerfield, Professor of Physical Geography at Edinburgh University; Vaughan Robinson, professor at King's College London; Michael Keith, professor of sociology at Goldsmiths, University of London; Gary Bridge, professor at Bristol University and Margaret Byron, professor at King’s College London.
Other graduates in geography taught by Ceri Peach at St Catz have achieved success in other fields and include Matthew Pinsent, who received four gold medals for rowing in successive Olympic Games.
Field of research
Ceri Peach’s main field of research is human migration and the racial segregation of minority groups, ethnic groups and religious groups in the United Kingdom, the United States and Western Europe.
During his sabbatical at the Demography Department of Australian National University, in 1973, his understanding of the relationship between spatial patterns of residential segregation was transformed. This led him to investigate ethnic intermarriage as an index of social interaction.
During his next sabbatical at Yale University, in 1977, he disproved the ‘triple melting pot theory’ of American cultural assimilation which, based on data collection in New Haven, Connecticut, argued that while national ethnic identity in the United States would dissolve, it would do so within maintained religious boundaries of Catholic, Protestant and Jewish. His research proved that while the so-called ‘Protestant pot’ seemed plausible, a ‘Catholic-pot’ seemed unlikely:
“As the Irish were residentially mixed with the British, Scandinavians and Germans, and separated from the Poles and Italians, this suggested an ‘old European’ rather than a ‘Protestant’ melting pot. There was, in fact, a white melting pot which began with the ‘old’ Europeans and into which Poles, Italians and, to an extent, Jewish populations were added as time went on.’
His research in the 1970s and 1980s focused on housing tenure and segregation in the United Kingdom and the United States and during this time he worked closely with Dr Samir Shah and later with Dr Margaret Byron.
In the 1990s and 2000s Ceri Peach continued his research on issues of segregation with particular focus on the dynamics relating to, and the arguments surrounding, Ghetto formation and White flight. This included differences between British and American cities and whether British cities had become more segregated than Chicago. He also examined the growth of the Muslim population in Europe, and particularly in Britain, and this has developed into a large scale study of the cultural geography of Muslim mosques, Sikh Gurdwaras and Hindu Mandirs on the landscape of Britain.
His Economic and Social Research Council funded project on ethno-religio-linguistic sub-communities links his database on Muslim, Hindu and Sikh places of worship in the United Kingdom, completed as a millennium project, and funded by the Leverhulme Trust, with the United Kingdom Census 2001 data on ethnicity and religion. The Leverhulme survey photographed and collected data on religion, tradition, movements, vernacular language, date of foundation and other variables on nearly 1,000 buildings. Ceri Peach is a member of the Advisory Board of the Oxford Centre for Islamic Studies and the Oxford Centre for Hindu Studies.
On 22 September 2007 Ceri Peach retired from St. Catherine’s College and a series of talks were given by former pupils and colleagues at the Oxford University Centre for the Environment on 22 September followed by a reception and speeches by Professors Ron J. Johnston and Gary Bridge. St Catz has created the Ceri Peach Trust Fund to honour the 40 years' contribution Ceri Peach has made to the study of geography at St Catz and to ensure that geography continues to flourish at the college. Recalling his time at the college he has remarked:
- ‘My career has been an exciting and a full one. I am grateful for the opportunities it has offered me to teach – and be taught by - my students, and also for the fellowship of my colleagues.’ 
Interest in rowing
Outside his research interests, Ceri Peach has maintained a keen interest in rowing:
- ‘Catz has had a strong stream of oarsmen – many of whom I have had the privilege to teach. Sir Matthew Pinsent (Geography, 1989) remains a golden star – he never missed a tutorial, never failed to produce an essay, took a good degree and demonstrated that athletes at a high level are more conscious of time planning, and more efficient at meeting commitments, than many others with far less pressure on them.’ 
- http://diversity.psy.ox.ac.uk/research-team/ceri-peach/ Retrieved January 1, 2011
- St. Catherine’s College: The Ceri Peach Trust Fund, St Catherine’s College Development Office, 2007
- St Catherine’s College Year, 2007; St Catherine’s College Development Office, 2007
- http://www.geog.ox.ac.uk/staff/cpeach.html Retrieved January 1, 2011