Professor R.P. Peeters is an internist-endocrinologist at Erasmus Medical Center in Rotterdam, the Netherlands. He is head of the Erasmus MC Academic Center for Thyroid Diseases, which is a tertiary referral center for patients with complex thyroid disorders. He is a member of the board of the Dutch Internist Society and of the European Society for Endocrinology. He has been a member of different international guideline committees (i.e. the guidelines on treatment of subclinical hypothyroidism, hypothyroidism and thyroid disorders during pregnancy).