Background: This portfolio contains two systematic reviews and several meta-analyses in the clinical field of psychosis and trauma. The aim of the first review was to synthesise findings relating to the acceptability of post-traumatic stress disorder (PTSD) treatments in people with psychosis. The aim of the second review was to synthesise and meta-analyse the prevalence figures and risk factors for psychosis-related PTSD (PR-PTSD). Methods: The reviews were conducted using narrative and meta-analytic techniques. Search processes followed Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Results and Conclusion: Detailed statistics are presented for each review. The first review found that PTSD treatments are generally acceptable in people with psychosis. Non-participation rates were low, feedback about the tolerability of treatments was generally good and dropout rates were comparable to other PTSD treatment studies. The second review largely agrees with earlier studies' conclusion that the evidence base for PR-PTSD as it stands makes it difficult to draw conclusions about prevalence rates. Hopefully, as awareness is raised into the issue of PR-PTSD firmer assessment processes will emerge, leading to more robust meta-analytic findings and research syntheses in the future.