Inventing by Combining Pre-Existing Technologies: Patent Evidence on Learning and Fishing Out. Research Policy (2017) 47(1), 252-265. [Pre-print] [Video Summary]

Combinations of technology in US Patents, 1926-2009: A Weakening Base for Future Innovation? Economics of Innovation and New Technology (2017). [Pre-print] [Video Summary]

Mandates and the Incentive for Environmental Innovation. With GianCarlo Moschini. Forthcoming in the American Journal of Agricultural Economics[Pre-print] [simulation code]

Intellectual Property Rights and the Ascent of Proprietary Innovation in Agriculture.  With GianCarlo Moschini. Annual Review of Resource Economics (2017) 9, 53-74. [Pre-print]

Does Regulation Hurt Innovation in Animal Pharma? The Case of New Animal Antibiotics. With Stacy Sneeringer. Poster at the 2017 AAEA Annual Meeting in Chicago, IL.

Research, Productivity, and Output Growth in U.S. Agriculture. With Keith Fuglie, Paul Heisey, and James MacDonald. Journal of Agricultural and Applied Economics (2017), 1-41.

Private Sector Research and Development. With Keith Fuglie, and Paul W. Heisey. Chapter in Handbook of Agriscience and Agribusiness, ed. N. Kalaitzandonakes (Forthcoming).

Pushing and Pulling Environmental Innovation: R&D Subsidies and Carbon Taxes. With GianCarlo Moschini. Presentation at the 2016 AAEA Annual Meeting in Boston, MA.

Incentives for Innovation: Patents, Prizes, and Research Contracts. With GianCarlo Moschini. Applied Economic Perspectives and Policy (2013) 35(2): 206-241. *winner of the 2013 Outstanding AEPP article.

Working Papers

The Economics of Innovation in Animal Pharma. With Stacy Sneeringer. Submitted (2017).