Jon is recommended in clinical negligence by the Legal 500, and in clinical negligence and professional discipline by Chambers & Partners:

Jonathan Holl-Allen, whose "calm and methodical approach lends authority to his advocacy." Solicitors believe that "his judgement in presenting cases both orally and in writing is excellent." Chambers and Partners 2010

Jonathan Holl-Allen is "a fine courtroom performer" who gets good results. Chambers and Partners 2010

'Jonathan Holl-Allen is “more than able to deal with most things thrown at him - very astute, he picks up on the issues and presents them to the court very well.”' Chambers & Partners 2009

'A barrister on the rise, Jonathan Holl-Allen is admired by solicitors as an “outstanding, well-prepared and thorough advocate who is reasoned in his analysis and able to wipe the floor with opponents in court.”' Chambers & Partners 2009

Professional Conduct and Performance  Jon has extensive experience of the General Medical Council and General Dental Council, in particular:
The Professional Conduct Committee of both bodies and the Interim Orders Committee of the General Medical Council.
He also appears before the following further Committees of the General Medical Council, namely:
The Health Committee.
The Assessment Referral Committee.
The Committee on Professional Performance.
The Registration Committee.

Police discipline  Jon has been involved in disciplinary hearings in many different contexts. He has appeared before the General Medical Council and on behalf of the Dental Practice Board he has conducted disciplinary hearings against dentists involving allegations both of inadequate professional treatment and dishonesty. He has been involved in disciplinary work in the financial services area and represented an insurance broker before his regulatory association.

GMC v Sreenath   [2002] UKPC 56 (GMC: circumstances in which cases can be transferred from the conduct to the health procedures under rule 51 of the Procedure Rules)

Experience in the professional conduct and performance fields include:  
An appeal from the Professional Conduct Committee of the GMC to the Privy Council.
An appeal by a GP against a refusal to renew his approval as a GP trainer.
Appeals from medical and dental discipline committees.
Advisory work/representation in FHSAA appeals and concerning the exercise by PCTs of functions under section 49 of the National Health Service Act 1977.
Judicial review of decisions by Committees of the GMC.