Decker was educated in Germany and the United Kingdom. She earned a Magistra Artium degree from the University of Cologne, followed by an MA and a PhD in history from the University of Liverpool.[1]
Decker's teaching career began at the University of Liverpool Management School as a lecturer in international business (2007–2010). She then joined Aston Business School, where she rose from lecturer to professor of organization studies and history by 2014.[1]
In 2020, she was appointed professor of strategy and history at the University of Bristol School of Management.[4] She returned to the West Midlands in 2022 to take up a chair in strategy at the University of Birmingham.[1] During her tenure at Birmingham, she served as the deputy dean of the business school from 2023 to 2024.[5]
She has held several international visiting positions, including a visiting professorship in African business history at the University of Gothenburg (2020–2023)[6] and a visiting role at the University of Cagliari (2019).[7]