His research encompasses both medical and agricultural bioethics, with a focus on ethical and policy issues arising from modern biotechnology. Recent publications include ”The Confinement of Animals Used in Laboratory Research: Conceptual and Ethical Issues,” in The Ethics of Captivity, ed. Lori Gruen (Oxford: Oxford University Press, 2014), “Ethical Issues in the Application of Biotechnology to Animals in Agriculture,” with John Basl, in The Oxford Handbook of Animal Ethics (2011), and “Chimeras, Moral Status, and Public Policy: Implications of the Abortion Debate for Public Policy on Human/Nonhuman Chimera Research,” The Journal of Law, Medicine, and Ethics (2010).