Hashim had held senior house jobs in surgery on the Royal Free Hospital rotation followed by specialist registrar posts at West Middlesex Hospital, Charing Cross Hospital, University College Hospital and Watford General Hospital. He was a Pelican Cancer Foundation Research Fellow followed by a MRC Clinician Research Training fellowship at University College London at which time a number of imaging and focal therapy trials were started. His research interests are in Health Technology Evaluation including multi-parametric MRI, Histoscanning, Tissue Type Imaging, as well as therapeutic interventions such as high intensity focused ultrasound, irreversible electroporation, and photodynamic therapy. He has completed three phase I/II clinical trials evaluating the role of focal therapy in prostate cancer and is Co-PI in a number of multicentre trials including the UK NIHR-HTA funded study PROMIS study evaluating the role of multi-parametric MRI in men with a raised PSA using Template Prostate Mapping as the reference standard as well as INDEX, a multicentre focal therapy study using HIFU with 3 year follow-up. He currently holds a MRC Clinician Scientist Fellowship for 5 years.

He currently holds a number of international and national committee memberships:

1. NCRI Prostate Clinical Studies Group, Member, 2012-2015

2. NCRI Prostate Clinical Studies Group (Diagnostic and Localised Disease Sub-group), Member, 2011-2015

3. NCRI Screening, Prevention and Early Diagnosis (SPED) Group, Member, 2012-2015

4. Cochrane Renal Group, Urology Lead Editor, 2010-current

5. European Urology journal, Editorial Board, Member, 2012-current

6. BJU International journal, Consulting Editor (Imaging), 2012-current