Dr Ian Johnson
Dr Johnson is a mathematician with experience in developing and writing biophysical computer simulation models incorporating environmental physics, plant, crop and pasture growth, soil hydrology, soil organic matter and nutrient dynamics, and animal growth and metabolism. Early in his career he was with the Biomathematics Department at the Grassland Research Institute in the UK and then the Department of Agronomy and Soil Science at the University of New England in Armidale, NSW. More recently, as director of IMJ Consultants, he has developed models in collaboration with universities and industry bodies in Australia and New Zealand.
He is widely published in the scientific literature, including as co-author of the textbook Plant and Crop Modelling (Thornley and Johnson, 1990, 2000).
Dave Clark is a dairy industry and research consultant. Between 1991 and 2013, he was Principal Scientist at the Dairying Research Corporation/Dexcel/DairyNZ. His research during that time looked at the intersection of farm economics and environmental impact, and was underpinned by a philosophy that environmental protection and profitable dairy farming are not mutually exclusive.
In 2009 he was awarded the New Zealand Grassland Trust – Ray Brougham Trophy for services to New Zealand farming systems. He carried out mainly hill country research when he worked at Grassland Division, Department of Scientific and Industrial Research in the early stage of his career.
Dr Brent Clothier
Principal Scientist with Plant & Food Research, Dr Clothier has extensive experience in soil science, especially with the measurement and modelling of water and solute movement in soil. He has published more than 300 peer-reviewed publications.
He was elected a Fellow of the Royal Society Te Apārangi in 1994, and was the President of the New Zealand Society of Soil Science from 2008 to 2010. He is an Academician (Foreign) of the Chinese Academy of Engineering (Agriculture Division).
Dr Donna Giltrap
Currently Research Priority Area Leader for Agricultural Greenhouse Gases Emissions and Mitigation at Manaaki Whenua – Landcare Research, Dr Giltrap is a modeller with a background in physics and mathematics. Her PhD is in physics and she also holds a Graduate Diploma in Applied Statistics.
She was part of the team that reviewed the nitrous oxide component of Overseer in 2018. She is a member of the New Zealand Soil Science Society.
Dr Clint Rissman
Dr Rissmann is the founder and Director of Land and Water Science Limited. He is also a Senior Adjunct Fellow in the Waterways Centre for Freshwater Management – a partnership between the University of Canterbury and Lincoln University. He has more than 10 years’ experience in earth systems science, specialising in water quality, biogeochemistry, greenhouse gases and systems thinking. He has co-authored a number of peer-reviewed publications researching soil and water quality in New Zealand.
He is a leading proponent of the physiographic approach which involves understanding water quality outcomes based on an integrated understanding of landscape properties.
Dr Nick Roskruge
Dr Roskruge is of Atiawa ki Taranaki and Ngāti Tama-ariki descent. He is Associate Professor in Horticulture at Massey University, and since 2003, has been Chairperson of Tāhuri Whenua, which represents Māori interests in the horticulture sector. He is a member of the Māori Advisory Board for Resilience to Nature’s Challenges – a National Science Challenge - and is also a member of the HSNO Committee of the Environmental Protection Authority (EPA). Previously he was Chair of Ngā Kaihautū Tikanga Taiao, the EPA’s Māori advisory committee.
He holds a PhD in soil science with his doctoral thesis looking at Māori land development through traditional knowledge, and the soil and horticultural sciences. He has had sabbatical periods in Peru and Chile, where he worked on crop genetics and indigenous systems projects. He was the 2013 recipient of a Fullbright Scholarship, undertaken at Cornell University (USA).
Dr Peter Thorburn
Dr Thorburn is a Chief Research Scientist and Research Group Leader in the Commonwealth Science and Industrial Research Organisation (CSIRO) in Queensland. He is responsible for agricultural systems research and is internationally recognised for his expertise in crop systems modelling.
He represents CSIRO on the Agricultural Production Systems Simulator initiative, which owns the APSIM advanced farming systems model, and is co-lead for crop modelling in the international AgMIP program. He has extensive experience in scientific advisory groups, including as a member of groups on managing water quality in Great Barrier Reef catchments and reviewing or advising on Overseer in 2012 and between 2014 and 2017.
Dr Robin White
Dr White is Assistant Professor of Integrated Beef Systems Management at Virginia Tech in the United States. She is a member of the American Dairy Science Association, an editor for the Farm Systems Analysis and Economics and Resources and Environment sections of the Journal of Dairy Science, and an Editorial Board member of the Journal of Animal Science.
Her research focuses on leveraging data analysis and animal nutrition to enhance the sustainability of food production systems. She graduated from Washington State University as a Doctor of Philosophy in Animal Sciences.