John Grimshaw is an acknowledged botanist, gardener and author. He has been Director of The Yorkshire Arboretum since 2012, from which he is seconded for one day a week to work on TSO. Previously he managed the gardens at Colesbourne Park, Gloucestershire and was lead author for the International Dendrology Society of New Trees, Recent Introductions to Cultivation (with Ross Bayton), published in 2009 by RBG Kew. He has written widely for numerous horticultural publications and previous books include Snowdrops, A Monograph of Cultivated Galanthus (with Matt Bishop & Aaron Davis, 2002). He is a member of the Royal Horticultural Society’s Woody Plant Committee, Gardens Committee and Nomenclature and Taxonomy Advisory Group.
Tom Christian is a consultant dendrologist with a very wide experience of trees and collections throughout the UK, Ireland, and beyond, with extensive fieldwork experience around the world. Tom studied Horticulture with Plantsmanship at the Royal Botanic Garden Edinburgh, graduating in 2008, and continued to be based there until summer 2017, working closely with the International Conifer Conservation Programme on collaborative projects throughout the UK. Since 2017 he has been a Research Associate of the RBGE and he is a member of the IUCN conifer specialist group.