R. David Holbrook is a research chemical engineer with Surface and Microanalysis Science Division at the National Institute of Standards and Technology (NIST) located in Gaithersburg, MD. Dave received a B.S. in Biological Systems Engineering and M.Eng. degree in Civil (Environmental) Engineering from Cornell University (Ithaca, NY) and a Ph.D. in Civil Engineering from Virginia Tech (Blacksburg, VA), and was a National Research Council post-doctoral fellow with NIST where he focused on developing and implementing surface sensitive analysis techniques for environmental colloid characterization. Dave is a registered professional engineer in North Carolina having spent six years in industry designing biological wastewater treatment facilities. Dr. Holbrook has authored or co-authored over 20 peer reviewed manuscripts on topics ranging from colloid-facilitated transport of endocrine disruptors, detection and monitoring of anthropogenic activing in natural aquatic systems, behavior of engineered nanoparticles and microanalysis of environmental samples.