Dr. Stefano H. Baruffaldi

Affiliated Research Fellow

Innovation and Entrepreneurship Research
Assistant Professor, University of Bath



Innovationsökonomik, Wissenschaftsökonomik, Innovationsgeographie, Wissensdiffusion, internationale Mobilität von Wissenschaftlern, Innovation und Ungleichheit

Akademischer Werdegang

Seit 01/2019
Assistant Professor an der University of Bath

Affiliated Research Fellow am Max-Planck-Institut für Innovation und Wettbewerb (Innovation and Entrepreneurship Research)

03/2018 - 01/2019
Wissenschaftlicher Referent am Max-Planck-Institut für Innovation und Wettbewerb (Innovation and Entrepreneurship Research)

08/2016 - 02/2018
Affiliated Research Fellow am Max-Planck-Institut für Innovation und Wettbewerb (Innovation and Entrepreneurship Research)

07/2015 - 07/2016
Policy Analyst bei der OECD

09/2010 - 06/2015
Doktorand und wissenschaftlicher Mitarbeiter und Tutor an der Ecole Polytechnique Fédérale de Lausanne (EPFL). Dissertation: Three Essays on the Role of Proximity in Science and Innovation

09/2004 - 03/2010
Studium des Ingenieurswesens und Betriebswirtschaftslehre (B.Sc. und M.Sc.) an der Politecnico di Milano


Artikel in referierten Fachzeitschriften

Baruffaldi, Stefano Horst; Marino, Marianna; Visentin, Fabiana (2017). International Mobility and Research Careers: Evidence from a Mobility Grant Program, Academy of Management Proceedings, 2017,1. DOI

  • Despite the acknowledged importance of international mobility for science and innovation, there is limited evidence on the effect on researchers of incentives and programs to support it. In this paper we estimate the impact of an international mobility grant program on the careers of 946 researchers in Switzerland. Data from the Swiss National Foundation (SNSF) allow us to implement a Regression Discontinuity Design regression analysis to assess the causal effect of the program on a series of outcomes of interest. Looking at the years that follow the proposed starting year of the grant, awarded applicants result 54% more likely to be abroad in the first year than not awarded applicants. The effect of the grant extends beyond the period founded by the grant it-self. However, in line with the program objectives, return appears likely since this effect is reduced to 18% and is weakly significant on the fifth year. Over the same period, we find no significant effect on scientific productivity, when measured as number of publications, and a weakly significant negative effect, when measured as total number of citations. Similarly, we find no effect on the likelihood of obtaining a professorship position. On the contrary, we find a positive significant effect on the number of new co-authors. We discuss the implications of these results for the understanding of the effects of international mobility and for organizations that intend to support it.

Baruffaldi, Stefano Horst; Raffo, Julio (2017). The Geography of Duplicated Inventions: Evidence from Patent Citations, Regional Studies, 51 (8), 1232-1245. DOI

  • The geography of duplicated inventions: evidence from patent citations. Regional Studies. Innovators often claim inventions that turn out to duplicate, at least in part, existing ones. This paper advances the claim that for recent and upcoming inventions, competitive incentives are high, and localized knowledge flows increase the probability of duplication. Therefore, over a brief period of time the probability of duplication is higher at short geographical distance. Conversely, the duplication of less recent inventions is more likely at long distance as a consequence of a lower awareness of the existence of a technology. This claim is supported by coherent descriptive and multivariate evidence using data on patent citation categories from the European Patent Office (EPO).

Baruffaldi, Stefano Horst; Di Maio, Giorgio; Landoni, Paolo (2017). Determinants of PhD Holders’ Use of Social Networking Sites: An Analysis Based on LinkedIn, Research Policy, 46 (4), 740-750. DOI

    Baruffaldi, Stefano Horst; Marino, Marianna; Parrotta, Pierpaolo (2016). Self-employment, Start-up Incentives and Political Ideology, Applied Economics Letters, 23 (4), 250-254.

      Baruffaldi, Stefano Horst; Visentin, Fabiana; Conti, Annamaria (2016). The Productivity of Science & Engineering PhD Students Hired from Supervisors’ Networks, Research Policy, 45 (4), 785-796. DOI

      • We compare the scientific productivity of PhD students who are hired from a fine-grained set of mutually exclusive affiliation types: a PhD supervisor's affiliation, an external affiliation from which the supervisor derives her coauthors, and an external affiliation with which the supervisor has no coauthorship ties. Using a novel dataset of science and engineering PhD students who graduated from two major Swiss universities, we find that the most productive PhD category is the one made of students who are affiliated with universities other than their supervisors’ affiliation, but from which the PhD supervisors derive their coauthors. This result suggests an inverted U-shaped relationship between PhD students’ productivity and the social distance from their supervisors. Additionally, we find evidence consistent with the role of supervisors’ coauthor networks in resolving information asymmetries regarding PhD talent.

      Baruffaldi, Stefano Horst; Landoni, Paolo (2016). Mobility Intentions of Foreign Researchers: The Role of Non-economic Motivations, Industry and Innovation, 23 (1), 87-111.

      • Recent contributions suggest that non-economic factors could be important motivational drivers of scientific mobility. We investigate this hypothesis in a sample of foreign researchers in Italy and Portugal, examining their willingness to leave the host country. We distinguish between economic factors, non-economic relational factors and non-economic aspirational factors. Controlling for the relevant contextual variables, we find that foreign researchers, unsatisfied with aspirational factors (e.g. level of independence, autonomy, intellectual challenge and social status), are more likely to leave their host country and move to a third country than they are to return to their countries of origin. Relational and economic factors, such as salary and benefits, do not demonstrate any additional impact.


      Poege, Felix; Harhoff, Dietmar; Gaessler, Fabian; Baruffaldi, Stefano Horst (2019). Science Quality and the Value of Inventions, arXiv preprint 1903.05020.

      • Despite decades of research, the relationship between the quality of science and the value of inventions has remained unclear. We present the result of a large-scale matching exercise between 4.8 million patent families and 43 million publication records. We find a strong positive relationship between quality of scientific contributions referenced in patents and the value of the respective inventions. We rank patents by the quality of the science they are linked to. Strikingly, high-rank patents are twice as valuable as low-rank patents, which in turn are about as valuable as patents without direct science link. We show this core result for various science quality and patent value measures. The effect of science quality on patent value remains relevant even when science is linked indirectly through other patents. Our findings imply that what is considered “excellent” within the science sector also leads to outstanding outcomes in the technological or commercial realm.
      • https://arxiv.org/pdf/1903.05020.pdf

      Baruffaldi, Stefano Horst; Poege, Felix (2019). A Firm Scientific Community, DRUID19, 4936. Copenhagen: Copenhagen Business School.

      • The diffusion of scientific knowledge to industry is instrumental to technological change and productivity growth. In this paper, we investigate the extent to which firms participate in scientific communities' activities and whether this facilitates the exchange and transfer of scientific knowledge to firms' technological activities. We focus on two modes of interactions of firms with scientific communities: the participation to and the sponsorship of international scientific conferences. We exploit a newly constructed database comprising the set of all conference proceedings in computer science from 1996 until 2015 from a specialized computer science database (DBLP) matched to Web of Science and Scopus and conference ranking information. We track knowledge transfers by patent and science citations to these proceedings. First, we document that both conference participation and sponsorship by firms is frequent and concentrated in the events of the highest quality. Contributions of firms at conferences are of higher average quality, even within individual conferences. Second, we go on to find that firms are significantly more likely to cite in their patents and papers the scientific articles presented at a conference which they attended relative to comparable articles presented at other conferences. We use airline connectivity between researcher and conference locations in an instrumental variable strategy to establish causality.
      • https://conference.druid.dk/acc_papers/45ci2gtnh996gaar52h23n4wfg5wfn.pdf


      Knowledge Lost in Capital
      Academy of Management Annual Meeting
      Ort: Chicago, US

      Knowledge Lost in Capital
      DRUID Conference
      Ort: Kopenhagen, Dänemark