Michael Holick

<p><b >Michael F. Holick</b>&nbsp;(born 1946) is an American endocrinologist, specializing in the field of&nbsp;<a href="http://en.wikipedia.org/wiki/Vitamin_D" title="Vitamin D" >vitamin D</a>, such as the identification of both&nbsp;<a href="http://en.wikipedia.org/wiki/Calcidiol" title="Calcidiol" class="mw-redirect" >calcidiol</a>, the major circulating form of vitamin D, and&nbsp;<a href="http://en.wikipedia.org/wiki/Calcitriol" title="Calcitriol" >calcitriol</a>, the active form of vitamin D. His work has been the basis for diagnostic tests and therapies for vitamin D-related diseases.</p>