Peter Hajek is Professor of Clinical Psychology and Director of the Health and Lifestyle Research Unit at the Wolfson Institute of Preventive Medicine.

His research is concerned primarily with understanding health behaviours, and developing and evaluating both behavioural and pharmacological treatments for dependent smokers and for people with weight problems. He has contributed to the establishment of the UK specialist stop-smoking service, training of its staff, and relevant NICE guidelines.

He is a recipient of research grants of over £10,000,000, holds a number of academic and editorial appointments, and authored or co-authored over 300 publications.