Director, Australian Food Information Centre, CSIRO-Sydney, Australia (1983-92)
Research Fellow, US Department of Agric, Mayaguez Res. Station, Puerto Rico-USA (1984-85)
Executive Director (R & D), Technology Transfer & Development – TTD International Pty Ltd, Sydney, Australia and Hamilton, New Zealand (1987-)
Research Fellow, Availability of Nutrients, Biochemical Aqua-Database, Oceanic Institute,Hawaii, USA (1991-98)
Visiting Professor, Biochem.of Herbal Extraction & Refining, Nagoya University, Japan (1992-97)
Professor (Hon.), Poly-culture for “Three Gorges Project”, Hubei University, China (1994-98)
Senior Consultant and Project Coordinator, UNIDO-IPS, Beijing, China (1996-98)
Senior Technical Advisor, China International Centre for Economical & Technical Exchanges (CICETE), United Nations Development Program (UNDP), Beijing, China, (1999-2000)
Professor (Hon.), Chinese Academy of Agricultural Sciences, Beijing, China (1995-99)
Research Associate and Consultant in Natural Therapeutics and Refined Herbal Pharmaceuticals, Regional Pharmaceuticals Ltd, Sydney, Australia (1995-2000)
R & D Consultant in Functional Foods & Herbal Extracts, Freedom Foods, Melbourne, (1995-)
International Coordinator & Project Leader, Joint China-Australian Project “Ecology Restoration and Management in the Mountainous Area Surrounding Bejing City”, International Cooperation Department, Commission of Science and Technology, Baoding, Hebei Province, China (1996-2000)
Project Leader, Computerised Quality Certification Network for Exported/Imported Food Commodities and Medicinal Herbs, AFIC, Sydney (Australia)–Lelystadt, (Holland) (1994-2001)
Director, R & D, Wild Herbs Pty Ltd, Sydney, Australia (1998-2001)
Chairman, Therapeutic Res.Fund,Charles Sturt Uni. Foundation,Bathurst, Australia (1998-2001)
International Research Project Coordinator, Camptotheca acuminata – Xi-Shu Tree for Cancer Cure & Prevention, Northern University Harbin, China (1999-2001)
Professor (Assoc.) in Therapeutic Research, Charles Sturt University, Bathurst, Aust. (1999-2001)
Project Coordinator, Joint Therapeutic Research Project on Medicinal Plants, Australia-Poland, Research Institute for Medicinal Plants, Poznan, Poland (2000-)
International Coordination, Distant Education Post-Diploma Courses for Medicine Graduates in Complementary Medicine, Pomeranian Medical Academy, Szczecin, Poland (2000-2002)
Director (R & D), Nature Corp Pty Ltd, Sydney, Australia (2001-2006)
Chairman, Therapeutic Research Oceania, Sydney Australia (2001-2004)
International Project Coordinator (Environmental Restoration), Forest NetWorld, Sydney Australia (2002-2004)
Chairman, Greening China Fund Ltd, Hong Kong-ZhuHai, Beijing (China) and Sydney (Australia) (2002-03)
Director of Research and Development, Natural Health International and NHI Inc. (2006-)
Director of Research and Development, Symphony Natural Health, Utah, USA (2018-)
Some 320 research & technical publications in professional journals, 21 books and 11 book chapters.
Honorary Professor, Hubei Agricultural Universiyty, Hubei Province, China (1993)
Honorary Professor, Chinese Academy of Agric. Science, Beijing, China (1996)
Visiting Professor, Nagoya University, Japan (1992)
Honorary International Editorial Board Member, Acta Poloniae Pharmaceutica (2001)
Editorial Board Member, Herba Polonica (2015-)
Coordinator of the Project “Identifying Phytochemical differences between Maca cultivated in Peru & China” in association with Chinese Academy of Medical Sciences, Institute of Medicinal Plant Development (IMPLAD), Beijing.
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