Dr Lisa Colledge is Snowball Metrics Project Director, representing Elsevier in this initiative. She has a background in the use of metrics in performance evaluation, built up through extensive customer contact via positions in publishing and data analysis. She was responsible for SciVal Strata, and also for the adoption of the journal metrics SNIP and SJR by Scopus. Before joining Elsevier, Lisa carried out post-doctoral research at the University of Edinburgh. She holds a doctorate in immunology and an MA in biochemistry, both from the University of Oxford.