We warmly welcome Prof. Lorenz T. Biegler from Carnegie Mellon University. He is visiting the d|b|t|a for a scientific exchange until the end of July 2022. Thanks to the nomination by Prof. Repke, Prof. Biegler received the Alexander von Humboldt Award. Parts of the award are designated for his stay at the d|b|t|a. Prof. Biegler is an internationally recognized expert in the field of nonlinear optimization and a long-time friend of our research group. Prof. Biegler is best known for his nonlinear optimization solver IPOPT and his work in the area of dynamic optimization, especially with respect to state estimation on moving horizons and nonlinear model predictive control.