Experience and Training

Photograph of Dr Katz

Training and Background

Dr Katz studied Medicine at Cambridge University (1985-1988) and University College London (1988-1991), qualifying in 1991. He began specialist training in endocrinology in 1994, whilst working in the internationally renowned Department of Endocrinology at St Bartholomew's Hospital.  Dr Katz returned to University College London (UCL) for specialist registrar training from 1994-2001, working with eminent endocrinologists at UCL , The Royal Free and Whittington Hospitals.  From 1996-1998, he undertook a 2-year research fellowship, culminating in an MD Thesis on "obesity and polycystic ovary syndrome". In 1999, Dr Katz worked as a registrar in Sydney, Australia, gaining an international perspective on endocrinology.

Consultant Career

Dr Katz has worked as a Consultant in Diabetes & Endocrinology since 2002. In 2005, Dr Katz was appointed as Consultant Endocrinologist at Barnet Hospital. In 2009, Dr Katz was elected as a Fellow of the Royal College of Physicians (FRCP) - an honour granted to consultants providing the highest standards of care.

NHS Practice

Dr Katz works as a Consultant in Diabetes & Endocrinology for the Royal Free London NHS Foundation Trust, based at Barnet Hospital. He treats patients with diabetes, thyroid disease and other hormone imbalances.

Private Practice

Dr Katz sees private patients at the following 3 locations:

The Wellington Outpatient Centre in Golders Green on Mondays 4pm - 6pm

The Cavell Hospital in Enfield on Wednesdays 4pm - 6pm

The Spire Bushey Hospital on Fridays 2.30pm - 4.30 pm:


Which Hormone Imbalances does Dr Katz Treat?

Dr Katz has wide experience in managing many endocrinological disorders. The hormone imbalances he treats include, but are not limited to:

  1. Overactive thyroid (thyrotoxicosis)
  2. Underactive thyroid (hypothyroidism)
  3. Thyroid enlargement / goitre
  4. Polycystic ovary syndrome
  5. Diabetes- Type 1, Type 2 diabetes and diabetes prevention
  6. Pituitary disease (e.g.prolactinomas, pituitary tumours)
  7. Testosterone deficiency
  8. Addison's disease (and adrenal disorders)

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Dr Jonathan Katz, Consultant Endocrinologist, treats patients with the full range of hormone imbalances, including thyrotoxicosis, underactive or overactive thyroid, goitre, thyroid nodules, polycystic ovary syndrome, polycystic ovaries, high prolactin, prolactinoma, pituitary disorders and diabetes. Dr Katz is a specialist in the field of Endocrinology, with private clinics at the BMI Hendon Hospital, Spire Bushey Hospital, Cavell Hospital (Enfied) and Wellington Diagnostics & Outpatient Centre in Golders Green. These clinic locations are ideal for patients from North London, Hertfordshire, Herts, Essex, Enfield, London, Arkley, Barnet, East Barnet, Friern Barnet, Borehamwood, Elstree, Bushey, Finchley, East Finchley, Finchley Central, Woodside Park, West Finchley, Hadley Wood, Whetstone, Totteridge, Southgate, Radlett, Cheshunt, Waltham Cross, Potters Bar, Shenley, Golders Green, Cricklewood, Neasden, Kenton, Hampstead Garden Suburb, Hampstead, Wembley, Hendon, Mill Hill, Muswell Hill, Wood Green, Edgware, Harrow, Stanmore, Watford, Northwood, Pinner.