Tore Opsahl is a Research Associate at Imperial College Business School. He holds a PhD from University of London, where he also earned his bachelor’s degree (in combination with University of California, Irvine).

The main topic of Tore Opsahl's work is organisational design, or how to organise for effectiveness. Previously, he focused primarily on network science to understand interaction and collaboration patterns. This work included both theoretical modelling and empirical analysis of networks as diverse as online communication networks, airline networks, scientific collaboration networks, neural networks, and intra- and inter-organisational networks. More recently, he has joined a project to investigate organisational design for effective prevention of mother-to-child transmission of HIV-programmes. This is a Global Fund to Fight AIDS, Tuberculosis and Malaria-sponsored and UNAIDS-convened project that aims to identify areas for improvement in service delivery of treatment programmes.

In addition to having published a number of research articles, Tore Opsahl writes a blog on methodological advances in network science. It is focused on methods related to weighted networks, two-mode networks, and longitudinal networks. Although these three features are enormous sources of data, only a few social network measures are able to include them. Therefore, they are often overlooked or ignored in emperical studies. By discarding these features, the richness of the data is considerably reduced, which in turn, limits the analysis. Moreover, to disseminate measures and algorithms proposed in research articles and on his blog, he is the author of an R-package aimed at analysing weighted networks, two-mode networks, and longitudinal networks. This package is named tnet and is available through the CRAN-servers. His blog can be found at http://toreopsahl.com/ and the supporting website for tnet at http://opsahl.co.uk/tnet/