This thesis is submitted in partial fulfilment of the requirements for the degree of Doctor of Forensic Clinical Psychology (ForenClinPsyD) at the University of Birmingham. The thesis consists of two volumes. Volume I is comprised of three chapters. The first chapter presents a synthesis of the qualitative literature pertaining to men's experiences of psychosis. The second chapter presents the empirical paper of a qualitative study exploring men's experiences of engaging in psychological therapy in a forensic mental health setting. Finally, the third chapter contains a public domain paper outlining the research undertaken in the empirical paper suitable for a public audience. Volume II contains five Clinical Practice Reports (CPRs) which represent clinical work carried out across various specialities: Adult Mental Health, Learning Disability, Child and Adolescent Mental Health and Prison. The first report presents a cognitive-behavioural and psychodynamic formulation to understand the presenting problems of a South Asian male. The second report presents a service evaluation examining the level of engagement with psychological interventions on a medium-secure inpatient Personality Disorder recovery ward. The third report is a case study of an adult male in a medium-secure unit presenting with Personality Disorder and Autism Spectrum Disorder traits. The fourth report is a single-case experimental design investigating the change in self-harming behaviour of an adolescent female. Lastly, the final CPR was a case study of a female prisoner delivered as an oral presentation for which an abstract is presented. To my parents and sisters for all your sacrifices, so I could reach my goals. First and foremost, thank you to my Academic Supervisor, Professor John Rose and Clinical Research Supervisor, Dr Abdullah Mia for their unwavering support and incredible patience throughout the completion of this thesis, especially when it seemed near impossible! Your faith in me has been invaluable. I would also like to express my appreciation to Dr Ashley-Christopher Fallon for his advice, guidance and insights over the course of the research project, and to Dr Andrew Fox for supporting me with the qualitative analysis. Thank you to the men who contributed to my research project by giving me their time and kindly sharing their stories with me. I hope I have captured the essence of your unique experiences. Last but by no means least, my heartfelt gratitude to my family, friends and supervisors who persistently stood by me during my several "crises of confidence", with unrelenting encouragement, love and words of wisdom. Thank you for being my strength when I needed it most, without you I would not have made it through.