Professor Maxwell was a chemist whose research was highly influential in establishing the University of Bristol’s reputation as a world-leading institution in the field of organic geochemistry. His major research focus was on the geological fate of natural product organic compounds produced by ancient algae and bacteria.
James joined the University of Bristol in 1968 and co-developed, alongside Professor Geoffrey Eglinton FRS, the Organic Geochemistry Unit. He was promoted to full Professor of Organic Geochemistry in 1990. He retired with over 250 publications, many of which have become seminal publications in the field. His research approach was characterised by exacting determinations of molecular structures and explorations of mechanisms of transformations, often requiring rigorous chemical separations and synthesis. James’ research spanned sediments, petroleum, and even extraterrestrial materials, notably lunar carbon, seeking to characterise complex mixtures of organic compounds and understand their origins and fate, thereby informing about ancient life and environments.
James was a major contributor to the formative period of molecular organic geochemistry as a discipline. He played a pivotal role in researching cyclic biomarkers, including their: structural elucidation; diagenetic transformations; precursor–product relationships; and, use as indicators of depositional environments and thermal maturity. Publication highlights included, in 1974, recognising the significance of steranes and hopanes in the Messel shale, and in 1980 the initial paper of a series of publications on molecular maturity parameters. The latter, co-authored with his student and fellow Scot, Andrew Mackenzie, remains one of the most widely cited publications in the field.
This work was instrumental in establishing fundamental principles used in petroleum exploration, providing molecular indicators of depositional environments and thermal maturity of source rocks. The distinctive red porphyrin pigments found in geological sediments and petroleum carried a special fascination for James. His research advanced the understanding of geological porphyrin origins, confirming links to chlorophyll, as first hypothesised in the Treibs’ scheme formulated the 1930s. This extremely challenging work involved extensive detailed identifications and characterisations of individual porphyrin structures to rigorously confirm proposed geological transformations.
James was mentor to more than 100 students and postdoctoral researchers, many of whom have continued as major exponents in the field of organic geochemistry, globally. James was elected Fellow of the Royal Society (FRS) in 1997 for his major contributions to understanding of the geological fate of natural product organic compounds. Several of those he mentored or supervised also went on to achieve that honour. He will be particularly remembered for his supportive supervision style - coaching, problem-solving, and razor-sharp analytical insights.
James was a constantly engaged and active member of the global organic geochemistry community, attending Gordon Research Conferences and European Organic Geochemistry meetings with regularity. After his retirement he became Editor-in-Chief of Organic Geochemistry, the primary output for the international dissemination of research in the field. In this role he championed the discipline - as only he could. He also was as painstakingly precise with the writing style as he was with the science; everyone in the community has been ‘Maxwelled’ - when a paper that has been accepted by reviewers and assistant editors comes back from the Editor-in-Chief with a multitude of small (but correct) comments on style and grammar.
James was widely known for his unmistakably and proudly Scottish personality, but it was distinctively his own. He was incredibly humble, even when the question he was about to ask was (usually accidentally) a killer. He cherished the discipline of organic geochemistry (often chasing Bristol colleagues to attend more of his favoured conferences) and was loved back. He is remembered for his humility - he retired early, an uncommon act in a career dominated by large egos, and he did so to spend time with his wife, children and grandchildren (so many swimming lessons) but also to make room for the next generation. He would share that with utter modesty with everyone in the field, which set a wonderful example of life-work priorities to the rest of us.
James was honoured for decades of influential research, leadership, and mentorship. In addition being elected FRS, he received the Alfred Treibs Award in 1989 from the Geochemical Society for major achievements in organic geochemistry.
He will forever be regarded as a founding father of the field, with a global impact, shaping modern molecular organic geochemistry for future generations.