Paul WG Elbers, MD, PhD (1975) is an intensivist at VU medical center, Amsterdam, The Netherlands. Special interests include quantitative acid base analysis, fluid therapy, ultrasound, pharmacokinetics, medical informa-tion technology, and the human microcirculation. The latter was the topic of his PhD thesis entitled "Focus on Flow, Imaging the Human Microcirculation in Periopera-tive and Intensive Care Medicine". Together with Prof. John A Kellum he edited the second edition of "Stewart's Textbook of Acid-Base". Together with Rainer Gatz, MD, he is the editor of www.acidbase.org, an online commu-nity for quantitative acid base analysis including clinical decision support tools.