Nominally focused on analytical chemistry, the Scheeline group has a variety of interests which you may explore in these web pages. The many disparate threads are connected by a theme of using physical theory, measurement science, and engineering to solve problems in chemical biology and materials characterization. Nonlinear systems, displaying non-periodic or non-monotonic behavior, seed most current interests. The need to monitor many species simultaneously has led to sensor and instrument development, with spin-offs feeding progress in answering conventional biomedical questions. We also are involved in the teaching, service, and economic development missions of the University of Illinois. Teaching links are available mainly through the WebCT server for those with passwords at www.chem.uiuc.edu. Outreach to high school students is through the WaterCAMPWS program, to students of all ages through participation in development of the Analytical Sciences Digital Library, and through participation in Project Skywatcher, under development by Jarnac Observatory.