The focus of Dr. Anthony Hollenberg’s laboratory is the molecular action of thyroid hormones. Dr. Hollenberg was among the first to identify that thyrotropin-releasing hormone (TRH) neurons in the hypothalamus serve as integrators of metabolic input, setting thyroid hormone levels within the context of body weight. He was also among the first to identify the role of specific co-repressors in negative regulation by the thyroid, helping to establish the idea that hormone sensitivity is due to the quantity of co-repressors present. Dr. Hollenberg has had an independent research laboratory since 1993 and with continuous funding from the NIH since 1995. Recently, the Hollenberg Laboratory has begun a new program investigating the development of functioning thyroid follicular cells from embryonic stem cells.