Dan Kroll is Chief Scientist at Hach Homeland Security Technologies. Dan has worked at Hach for 17 years in a variety of roles. Dan has been the lead researcher on a variety of method development projects for the physical, chemical and microbiological quality of water and soils for which he holds several patents. Dan has Bachelors degrees in Microbiology and Genetics and a Masters degree in Water Resource Management and Environmental Engineering from Iowa State University. Dan can be reached at 970-663-1377 ext. 2637 or email: DKROLL@hach.com.