Chat with us, powered by LiveChat

Our expert therapist, Jason O’Callaghan

The Ultimate Weight Loss Tutorial

50% off Stop Smoking Hypnotherapy Downloads Now

50% off Gastric Band Hypnotherapy Downloads Now

Subscribe to our Newsletter

Sign up & Get The D4 Clinics Free Secrets of Weight Loss Video

Call us now on 01 6855511 for a free phone consultation.

Jason O’Callaghan

Jason O'Callaghan D4Clinic

Jason O’Callaghan is a trained psychologist.

He holds a honors degree is Psychology and a Masters degree in Applied Psychology from Trinity College Dublin.

For his Masters research he was named in the 2012 Trinity College Roll of Honor after he developed a stress reduction program for cancer patients.

He is the only known practicing hypnotherapist in Ireland to hold a Masters in Psychology from Trinity College. He is also one of only three known hypnotists in Ireland to have an Honors degree in Psychology accredited by the Psychological Society of Ireland.

He is also one of only three hypnotherapists in Ireland trained in America as a Certified Instructor by the world famous National Guild of Hypnotists.

He is also qualified in Cognitive Behavioural Therapy (CBT) receiving his training from The Institute of Integrative Counselling and Psychotherapy (IICP).

He holds qualifications in Counselling from National University of Ireland in Maynooth and is a certified member of the National Guild of Hypnotists (NGH).

He also holds a Higher National Diploma in Media and worked for ten years interviewing world leaders, celebrities and international businessmen as part of his role as a journalist for Ireland’s biggest newspaper The Sunday Independent.

Dr Tim Trimble BSc (HONS) MSc MA PhD C. Psychol

Dr Tim Trimble is Junior Dean of Trinity College Dublin; a Lecturer in Applied Psychology and Course Director of the MSc in Applied Psychology at Trinity College Dublin. He is a Chartered Psychologist and expert in counselling psychology and Post traumatic stress disorder. He is available for one to one counselling and therapy sessions.

I am a Chartered Psychologist and Integrative Psychotherapist.

I am is also Junior Dean of Trinity College Dublin; a Professor in Applied Psychology and a Forensic Psychologist; and Course Director of the MSc in Applied Psychology at Trinity College Dublin.


I am trained as a psychologist and psychotherapist to work in an evidence-based, and considered manner, according to the needs of particular clients and contexts.

I work therapeutically with clients experiencing a wide range of life issues, difficulties, problems, and crises.  These may be the effects of childhood sexual abuse, relationship breakdown, domestic violence and major trauma.  I also work with those experiencing the symptoms of psychological disorders such as anxiety, depression, eating disorders, post-traumatic stress disorder.

I have expertise in forensic mental health assessment, and forensic investigation.  I deliver courses in suicide risk assessment, prevention, intervention, and postvention.  This links in with my expertise in Crisis Intervention and Stress management.  My Forensic Psychology experience also includes working with a range of clients in the criminal justice system, as well as those seeking assessment for such issues as civil and criminal injury claims.  I have also worked with the Police Ombudsman for Northern Ireland, and Serious and Organised Crime Agency.  My most recent research is in collaboration with the Probation Service in Ireland and northern Ireland, and An Garda Siochana, and the Police Service of Northern Ireland – this is evaluating techniques for sex-offender risk assessment. Research with the PBNI also includes evaluating anger management programmes for offenders in the community.

Jason O'Callaghan MBA

Trinity Honor for D4 Clinic therapist

Trinity College Provost Dr Patrick Prendergast and Minister Frances Fitzgerald presenting Jason O’Callaghan from the D4 Clinic with his parchment as he was named in the 2012 Dean of Students Roll of Honor for his voluntary work helping to reduce stress is cancer patients as part of his research for a Masters of Science (M.Sc) in Trinity College.

What experience does Jason O’Callaghan have?

Since leaving a career spanning over ten years in the national media where he developed his interviewing skills Jason has been a research assistant in AMNCH (Tallaght Hospital) Psychology department, supervised by the Head of Psychology. During his Honors Degree and Masters training in Trinity College he specialized within the field of psycho-oncology and has developed a humour therapy programe to reduce stress in cancer patients. This programme has been rolled out across Ireland with Jason running courses in cancer centers in Dublin, Bray, Wicklow, Mullingar, Monaghan and Laois. He has also presented his findings in stress reduction to a number of conferences for the Irish Cancer Society. For this work he was named in the 2012 Trinity College Roll of honors list. He is a fully trained Samaritans volunteer and worked with the organization for two years. He has also done voluntary work within both St Patrick’s University Hospital and Peamount Hospital.

What type of clients does he deal with now?

Jason now sees clients of all ages and backgrounds. These include a wide variety of issues from stopping smoking, stress reduction, weight loss, phobias, building confidence plus many more day to day issues.

To make an appointment with Jason O’Callaghan, call our therapist direct line on  01 6855511