In March 2017, Gizem Karaali interviewed Len Vacher, at the time the lead editor of Numeracy, the flagship journal of the National Numeracy Network. What follows is the extended transcript of this conversation, which ranges from quantitative literacy to computational geology, from transfer of learned content and skills to interdisciplinary collaboration. The interview was first published in Shifting Contexts Stable Core: Advancing Quantitative Literacy in Higher Education, edited by Luke Tunstall, Gizem Karaali, and Victor Piercey, and published in 2019 as MAA Notes Volume 88. It is reprinted here with the permission of the publisher. 1