First person - Seth Zimmerman.

First Person is a series of interviews with the first authors of a selection of papers published in Journal of Cell Science, helping early-career researchers promote themselves alongside their papers. Seth Zimmerman is the first author on 'Cells lay their own tracks - optogenetic Cdc42 activation stimulates fibronectin deposition supporting directed migration', published in Journal of Cell Science. Seth completed the work in this article as a PhD student under the supervision of Jim Bear and Brian Kuhlman at University of North Carolina at Chapel Hill, USA. He is currently a postdoc in Chris Counter's laboratory at Duke University in Durham, North Carolina, USA, investigating the basic cell biology of cancer and metastasis, and designing new approaches to study it.