Tracey Pilone is the Operations Director of Element 84, a startup in the DC area that offers mobile, Web, and backend development services. Recent projects she has worked on include writing for Naval Research Labs and Academic Business Consultants, as well as contributing to other Head First titles and keeping involved with the software development projects at Element 84. Before working as a writer, she spent several years working in and around the Washington, DC, area for two of ENRs (Engineering News Record) top 20 contractors as a construction manager in commercial construction. She is also the co-author of Head First Algebra. Tracey has a civil engineering degree from Virginia Tech and a masters of education from the University of Virginia, and holds a Professional Engineering License in Virginia.