Katharina Stanzel trained originally in plant genetics in Germany before moving to Australia to study marine biology. She worked as a marine biologist in Indonesia before returning to Europe, then spent around ten years at ITOPF, the International Tanker Owners Pollution Federation, as a scientist responding to shipping-related pollution incidents. She subsequently worked at the IOPC Funds, the United Nations-linked body handling compensation for oil pollution, before being recruited to INTERTANKO, where she served as Managing Director for around twelve years.
She spoke at Mare Forum's 1st Mare Forum Panama in 2016 and the 6th Blue Shipping Summit in 2016, both as a panellist.