In quantum computing, the use of multiple ion species holds promise for instance by mitigating crosstalk, enabling efficient sympathetic cooling, thereby providing a path toward large-scale trapped-ion quantum computers. Recently other applications such as quantum logic detection of chemical reactions or reduction of uncertainty in multi-species clocks have been demonstrated. This seminar aims to bring together experts from these diverse research areas to explore synergies and foster collaboration in the control of multi-species trapped-ion quantum systems. By addressing shared challenges, such as mixed-species crystal dynamics and the development of efficient quantum logic protocols, we seek to identify synergy and foster collaboration in this rapidly evolving field.