NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

NBER Publications by Sangjoon Lee

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Working Papers and Chapters

June 2009International Knowledge Flows: Evidence from an Inventor-Firm Matched Data Set
with Jinyoung Kim, Gerald Marschke
in Science and Engineering Careers in the United States: An Analysis of Markets and Employment, Richard B. Freeman and Daniel L. Goroff, editors
November 2006International Knowledge Flows: Evidence from an Inventor-Firm Matched Data Set
with Jinyoung Kim, Gerald Marschke: w12692
We describe the construction of a panel data set from the U.S. patent data that contains measures of inventors' life-cycle R&D productivity--patents and patent citations. We match the data set to information on the U.S. pharmaceutical and semiconductor firms for whom they work. In this paper we use these data to examine the role of research personnel as a pathway for the diffusion of ideas from foreign countries to U.S. innovators. In particular, we find in recent years an increase in the extent that U.S. innovating firms collaborate with or employ researchers with foreign experience. This increase appears to work primarily through an increase in U.S. firms' employment of foreign-residing researchers; the fraction of research-active U.S. residents with foreign research experience appears t...
July 2005The Influence of University Research on Industrial Innovation
with Jinyoung Kim, Gerald Marschke: w11447
We use U.S. patent records to examine the role of research personnel as a pathway for the diffusion of ideas from university to industry. Appearing on a patent assigned to a university is evidence that an inventor has been exposed to university research, either directly as a university researcher or through some form of collaboration with university researchers. Having an advanced degree is another indicator of an inventor's exposure to university research. We find a steady increase in industry's use of inventors with university research experience over the period 1985-97, economy wide and in the pharmaceutical and semiconductor industries in particular. We interpret this as evidence of growth in the influence of university research on industrial innovation. Moreover, during this period we...

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