We have presented a journey through the evolution of our understanding of the Fe biogeochemical cycle both past and present. This journey is both personal and professional as seen through the eyes of two colleagues who have worked together, on and off, for nearly 30 years. A starting point to this journey, in both cases, was the lab of Bob Berner in New Haven, Connecticut, whose inspiration and insights were pivotal to the both of us. This story would not be possible without him.

Through our careers we have seen profound changes in both our understanding of the Fe cycle...

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