Dr Sheridan has worked as a forensic psychologist for 20 years. She is recognised as a global expert on stalking and has published several books and more than 50 scientific papers on this subject. 

She has also published on the following topics: Islamophobia, racial and religious discrimination, suicide in prisons, celebrity worship, offender profiling, mentally disordered offenders, male rape, internet sex offenders, threat assessment, the role of psychology in forensic science. 

In the UK she was one of a few accredited Behavioural Investigative Advisors ('offender profilers') and worked with the police on both active and cold cases. She regularly provided input to the police and other agencies (both public and private) in murder, domestic violence, stalking, and threatening communication cases.