Definition
A criminal career is the longitudinal sequence of an individual's offending, characterised along several dimensions: onset (age of first offence), frequency (offences per year while active), duration (length of the active period), specialisation (whether offending concentrates in one offence type or spreads widely), severity (escalation or de-escalation over time), and desistance (the age and process of stopping).
The criminal-career frame, developed by Alfred Blumstein and colleagues in the 1980s, replaces the older question 'what causes crime?' with the more productive 'what causes onset, what sustains an active career, and what produces desistance?' These are different questions with potentially different answers.
Why it matters
How it works
Researchers reconstruct careers from official records (arrests, convictions) and from longitudinal self-report studies such as the Cambridge Study in Delinquent Development. Each dimension — onset, frequency, duration, severity, desistance — is then analysed as a separate process with its own correlates. Onset is shaped most heavily by family, peer, and neurodevelopmental factors; frequency tracks situational opportunity and routine; desistance correlates with employment, marriage, and identity-level shifts in the way an offender narrates their own life.
Criminal-career data drive risk-assessment instruments, parole-board reasoning, and selective-incapacitation policies. They also frame the moral and legal treatment of juveniles: most adolescent offenders are short-career, so heavy-handed responses risk damaging life trajectories with little public-safety gain. The frame's central methodological challenge is right-censoring — researchers observe people for a finite window, so apparent "desistance" may just be the end of observation, not the end of offending.