External examiner: PhD thesis for Aida Moses University of Central Lancashire The relationship between executive functioning and autobiographical memory in a population of older adults. November 2005 External examiner for Michelle Lee Department of Psychology, Royal Holloway, University of London Social Problem-solving: Its association with past experience and depressive symptoms. September 2006. External examiner for Kylie Sutherland. The University of New South Wales. Autobiographical memory in Posttraumatic Stress Disorder September 2006