Daniel Brannan is a professor of biology at Abilene Christian University in Texas. He received a bachelor’s degree in biology from the University of New Mexico, a master’s degree in microbiology from the Ohio State University, and a doctorate in microbial ecology and physiology from UNM. He worked as a research scientist for Procter & Gamble until 1988 and since then has taught freshmen biology, microbiology, behavioral biology, sociobiology, and biostatistics at ACU. He has published more than 30 scientific papers and chapters in books, and presented more than 50 invited lectures, abstracts, and workshops at international and national meetings. He was the editor of the first practical handbook establishing microbiology of consumer products as a field of microbiology, Cosmetic Microbiology: A Practical Handbook (CRC Press). His research interests have included microbial ecology of thermophiles, biofilms, resistance mechanisms of bacteria to biocides and preservatives, behavioral ecology of pupfish and agouti, and adoption practices of humans and other animals as self-interested behaviors rather than altruism.