Dr Bowler qualified with distinction from St. Thomas's Hospital Medical School in 1984, subsequently training in general medicine in London and in general neurology at Atkinson Morley's Hospital (now part of St. George's). Further training in general neurology, stroke and dementia followed at Charing Cross Hospital where he obtained his MD investigating changes in brain blood flow in stroke.
A 3-year fellowship in London, Ontario at the University of Western Ontario followed where he did further research in stroke and dementia before returning to Charing Cross Hospital.
He was appointed Consultant Neurologist at the North Middlesex and Royal Free Hospitals in 1998 where he practices general neurology with a TIA clinic at the Royal Free Hospital. He was appointed Consultant to University College London Hospital in 2010 and takes part in the multidisciplinary team caring for patients with aneurysms and brain vascular malformations at the National Hospital for Neurology and Neurosurgery at Queens Square.
Dr. Bowler has over 40 publications on stroke and vascular cognitive impairment and has co-authored one book on vascular cognitive impairment.