This volume contains a selection of the contributed papers from the 26th Biennial Meeting of the Philosophy of Science Association, which was held in Seattle, Washington, from November 1 to 4, 2018. We received 356 submissions, from which the program committee selected 178 (50%) for presentation at the meeting and 43 (12%) for publication in this volume. A second proceedings volume containing selected symposium papers and Sandy Mitchell’s presidential address will be published next year.

I am extremely thankful for the many people who helped make this issue possible. Most importantly, the members of the PSA 2018 program committee put an enormous amount of time into reading and evaluating papers:

Rachel Ankeny (University of Adelaide)

Robyn Bluhm (Michigan State University)

Matthew Brown (University of Texas, Dallas)

Raffaella Campaner (University of Bologna)

Ruey-Lin Chen (Taiwan National Chung Cheng University)

Lindley Darden (University of Maryland, College Park)

Mathias Frisch (Leibniz University Hannover)

Robin Hendry (Durham University)

Kristen Intemann (Montana State University)

Elizabeth Irvine (University of Cardiff)

P. D. Magnus (University at Albany)

Michela Massimi (University of Edinburgh)

Conor Mayo-Wilson (University of Washington)

Wayne Myrvold (Western University)

John D. Norton (University of Pittsburgh)

Jay Odenbaugh (Lewis and Clark College)

Manuela Fernández Pinto (University of the Andes)

Angela Potochnik (University of Cincinnati)

Dean Rickles (University of Sydney)

Jan-Willem Romeijn (University of Groningen)

Daniel Steel (University of British Columbia)

Jacob Stegenga (Cambridge University)

Charlotte Werndl (University of Salzburg)

Julie Zahle (University of Bergen)

Kevin Zollman (Carnegie Mellon University)

They did a wonderful job, and I am indebted to them not only for the time they put into their reviewing tasks but also for the advice they provided throughout the process. Despite their intense workload, they stayed on schedule and maintained a great attitude.

I am also very grateful to PSA Executive Director Jessica Pfeifer, who worked tirelessly to make our 2018 conference happen. Seeing all her efforts behind the scenes (including all the time she put into guiding me through the various stages of my work) has given me new appreciation for what an amazing executive director we have. Jessica’s assistant, Tyler Karlsen, also graciously aided me in working with our new online system for generating the PSA 2018 program.

Wendy Parker, the PSA 2016 program chair, was a constant source of advice and encouragement. She went far above and beyond the call of duty by creating written notes to guide me and future program chairs through our tasks. I also benefited from being able to follow the example of Chris Smeenk, the PSA 2014 program chair who gave me the opportunity to serve on his program committee.

In addition, I would like to thank the Philosophy of Science editorial team, particularly Editor in Chief Andrea Woody and Managing Editor Michelle Pham. It was a pleasure to work with them throughout the production process. Michelle was particularly generous in her efforts to make my job as easy as possible; she answered my questions, taught me what I needed to know, managed the flow of papers, and expertly adjusted the software system for me. Our society is fortunate to have such a well-run journal.

Finally, I am grateful to Sandy Mitchell and the PSA Governing Board for giving me the opportunity to serve as PSA 2018 program chair and for providing financial support that allowed me to have a reduced teaching load while doing so. One of the most rewarding aspects of serving in this position has been the opportunity to learn about the wide range of scholarship produced by our PSA members. I am thankful to everyone who contributed to the PSA 2018 meeting and to the authors who wrote the papers that make up this volume.