Graduating from the University of Portsmouth in July 1995, and having worked as a pre-registration pharmacist in Hope Hospital, Salford, Manchester, Mark registered with the Royal Pharmaceutical Society of Great Britain (RPSGB) in July 1996. From there he went on to work as a resident pharmacist at Addenbrookes Hospital Cambridge whilst concurrently working community locums evenings and weekends, before specializing as a clinical pharmacist in August 1998.

Spending 4 years at St Helier Hospital, Carshalton, covering all the surgical disciplines, general surgery, urology, orthopedics and ophthalmology, attending regular twice weekly consultant ward rounds in each of these, Mark also maintained an input into medical disciplines, attending a regular gastro-enterology & rheumatology and later endocrinology consultant ward round once a week, as well as cross covering both general medical and cardiology wards, as well as the tertiary renal unit, as needed. Within 2 years, Mark additionally had responsibility for A&E / admissions for 1 year, and then the intensive care unit for just over 1 year, before moving onto Mayday University Hospital, Croydon in May 2002 to specialize further as a critical care pharmacist, during which time, he provided cross-cover for the neonatal special care baby unit amongst others, a post he held for an additional 4 and a half years until leaving to work as a locum in October 2006.

Amongst other responsibilities Mark has acted as a tutor for pharmacists undertaking either the University of Brighton post-graduate clinical therapeutic modules, or the London School of Pharmacy post-graduate diploma in clinical pharmacy. Mark has also acted as a CPD facilitator.