Karen Andrea Steidinger passed away on June the 11th 2023, aged 84 years. She was a highly eminent marine biologist whose almost six decades of research with State Institutions in Florida, USA made important contributions to phycology and oceanography. Karen is most notably remembered as a pioneer in research on ‘red tides’, now usually referred to as studies on harmful algal blooms (HABs), since they are seldom red or anything to do with tides. HABs are now recognised as a serious threat to human health and welfare worldwide, and a large research field has developed to investigate HABs, starting with...

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