Speakers in Organic Materials / pi-Systems (Cologne) 2025: 1. Mike Haley (Univ. Oregon, Eugene, USA) 2. Harry Anderson (Oxford, UK – Vogel Lecture) 2026: 3. Eli Zysman-Colman (St. Andrews, UK – GDCh Lecture) 4. Manabu Abe (Hiroshima University, JP)