We are pleased to announce that our colleague Philipp Nuspl has successfully defended his Ph.D. studies today. His thesis was written under the supervision of Veronika Pillwein at RISC, and Philipp only spent the last few months of his time as Ph.D. student at the Institute for Algebra. In his thesis, he explored properties of sequences satisfying linear recurrences with non-constant coefficients which themselves satisfy linear recurrence equations with constant coefficients. The thesis has resulted in several publications at high-rank venues in the area of computer algebra. We congratulate Philipp on his achievements and wish him all the best for his future.