Patrick Collins graduated in economics from Cambridge University in 1976, and worked as part-time assistant to Leo St. Clare Grondona while working for his MSc and PhD at Imperial College Management School. He devised a means to simulate how Grondona’s system of conditional currency convertibility based on commodities would operate, and performed a first simulation for the case of Japan when working there in 1996. He has presented papers on various aspects of the Grondona system at conferences of the Public Choice Society, Japanese Monetary Society, Japanese Economic Policy Association and RIFCON (Riba-Free Conference) in Kuala Lumpur. He also collaborated in the development of a computer model of the Grondona system which has been used to simulate its operation in Indonesia, Malaysia, Turkey and Pakistan. Having taught economics for 19 years in the Department of Environmental Science at Azabu University in Japan, he became Emeritus Professor on his retirement in 2018. He continues to advocate the implementation of the Grondona system as the ideal foundation for the coming multi-polar world economic system that is necessitated by the decline of the US dollar-based system.