Foundations of Systematics and Biogeography (PDF)

David M. Williams is a diatom researcher and Head of Global Biodiversity Group in the Department of Botany, The Natural History Museum, London.
He has published over 150 scientific papers, including 6 books. Among his books he is a co-author of the standard text Cladistics: The Theory and Practice of Parsimony Analysis (1992) and co-editor on Models in Phylogeny Reconstruction (1994) and Milestones in Systematics (2004). He is interested in the history and theory of systematics and biogeography and the systmatics of diatoms.

Malte C. Ebach is the WP5 Scientific Coordinator for the European Distributed Institute of Taxonomy at the Botanic Garden and Botanical Museum Berlin-Dahlem. His interests include the history and theory of comparative biology (systematics and biogeography), Goethe's way of Science and when he has the time, trilobite taxonomy.

From the reviews:

"Using a historical approach, Williams (Natural History Museum, London) and Ebach (Freie Universität, Berlin) illuminate the differences among the competing philosophical camps of systematicists. Their work provides incisive definitions of many conceptual and interpretational aspects of systematics and biogeography. … The authors’ apparent intent is … to provide focus for the next phase of debate on the practice and philosophy of phylogenetics. Summing Up: Recommended. Graduate students and researchers/faculty." (S. R. Fegley, CHOICE, Vol. 45 (9), 2008)

"This is a book worth pondering. … Williams and Ebach have produced a book from which almost all of us can learn things we did not know about the history and practice of our field. It should be especially useful for students, who may even discover that there is more to systematics than just choosing a model, running some software, and varying its parameters until the results seem at least vaguely palatable." (Norman I. Platnick, Systematic Biology, Vol. 85, 2009)