International Governing Committee

Kristin A. Hicks

NCDA&CS Agronomic Division, USA

As laboratory director at the NCDA & CS Agronomic Services Division, Kristin Hicks manages an agricultural laboratory conducting nutrient testing on plant tissue, agricultural water and solutions, manure and compost, and soilless media analyses. She develops test interpretations and nutrient management recommendations for growers and producers in North Carolina and throughout the United States.

Kristin holds a PhD, was Chair of the LOC for ISSPA 2025 and is current Chair of the IGC.

Dustin Sawyer

Rock River Laboratory, USA

As the Chief Operations Officer for Rock River Laboratory, Dustin uses his 20+ years of experience in soil analysis to help oversee laboratory operations across the globe. He served as organizing co-chair of the 18th ISSPA, held in 2025. Dustin holds a MSc and has served the industry as president of the Soil and Plant Analysis Committee, president of the National Forage Testing Association, and a long-time board member of the Agricultural Laboratory Testing Association, where he currently chairs the certification committee

Arjan Reijneveld

Eurofins Agro Testing, The Netherlands

Arjan Reijneveld is International Director of Agri‑Science & Development at the Eurofins Competence Centre. He works on the development and international implementation of integrated soil health assessment tools, including the Soil Health Indicator, which combines chemical, physical, biological, contaminant and carbon‑fraction parameters. His work supports land managers, advisory services, the agri‑food sector, researchers and governmental organizations in applying evidence‑based soil and crop management. Arjan also publishes on output‑based approaches to soil and nutrient management. Arjan is the prior Chair of the IGC and chaired the LOC for ISSPA 2019

Rodrigo Ortega

Technical University Federico Santa Maria, Chile

Agronomist, University of Concepción, Chile.
Master of Science (MS), Colorado State University, USA.
Doctor of Philosophy (PhD), Colorado State University, USA.
Specialist in soil fertility, plant nutrition, and precision agriculture.
Professor at Universidad Técnica Federico Santa María, Chile.
Founding member of the International Society of Precision Agriculture.
Founding member and first president (2018-2022) of the Latin American Association of Precision Agriculture. Vice-president for the 2024-2026 period.
Co-owner and Technical Manager of Neoag Precision Agriculture, Chile.
Owner and General Director of Agriservice Laboratory, Chile.
International and national advisor on soils and precision agriculture.
Director of the Research Group on Soil, Plant, Water and Environment (GISPA)
Author or co-author of more than 180 scientific and extension publications. Rodrico was the chair of the LOC for the 17 th ISSPA held in Chile in 2023.

Graham Lancaster

Environmental Analysis Laboratory, Australia

Graham is Director/ Manager of the EAL (Environmental Analysis Laboratory) at Southern Cross University, Lismore, Northern NSW, Australia and has built up the EAL over last 35 years. EAL now supports over 80 staff and has a commercial income of over $10M per year with continued national and international growth. A member of ASPAC (Australasian Soil & Plant Analysis Council) for over 10 years and currently NSW representative.

Bob Miller

Agricultural Laboratory Proficiency Program, USA

Dr. Robert Miller is the Technical Director Agricultural Laboratory Proficiency (ALP) Program and Secretary/Treasurer of the Soil and Plant Analysis Council (SPAC). He coordinates laboratory proficiency testing programs for Ag soils and botanical analysis; geo-tech root zones; compost analysis and provide technical support for the Minnesota manure analysis proficiency program. He has co-authored five methods of analysis manuals, conducted educational laboratory workshops, provides consulting services and conducts research into agricultural analysis[

Rao Mylavarapu

University of Florida, USA

Rao Mylavarapu is a professor, and leads the Sustainable Nutrient Systems program in Soil, Water and Ecosystem Sciences Department, University of Florida (UF). He has over 42 years of experience in soil and nutrient management areas. He worked as Soil Scientists in[DP2.1] India, USDA-ARS, and Clemson Universities prior to UF. He also served as the Director of ANSERV Labs at UF for the past ~27 years. He is a Fellow of both the American Society of Agronomy and the Soil Science Society of America. He managed over $22 million of collaborative grants, published over 130 research papers, 200 extension articles and delivered over 600 lectures worldwide on sustainable nutrient management. He has been associated with SPAC for the nearly 25 years and has served as the Vice-President and the President of Soil & Plant Analysis Council, and organized the 12th Symposium in Crete, Greece and the 13th ISSPA Symposium in Queenstown, New Zealand. He served as the Inaugural Chair of the International Governing Council from 2019 and chaired the 17th ISSPA Symposium in 2023 in Concepcion, Chile.

Warren Webber

Australia

Warren brings a wealth of experience to the IGC, especially regarding the organisation of Symposia. He is co- opted to the IGC by The Australasian Soil and Plant Analysis Council, Australia