Till D. Frank received his diploma in physics from the University of Stuttgart in 1996 under the supervision of Prof. Hermann Haken. He obtained his Ph.D. in Human Movement Sciences from the Vrije Universiteit Amsterdam in 2001, and his Habilitation in Physics from the University of Münster in 2006. He is currently Associate Professor at the University of Connecticut affiliated with both the Department of Psychological Sciences and the Department of Physics.

Chapter 1. Introduction.- Chapter 2. Nonlinear physics and synergetics.- Chapter 3. Epidemiological models and COVID-19 epidemics.- Chapter 4. Nonlinear physics of epidemics: part A.- Chapter 5. Nonlinear physics of epidemics: part B.- Chapter 6. Nonlinear physics of epidemics: part C.- Chapter 7. Model-based reproduction numbers.- Chapter 8. Modeling interventions.- Chapter 9. Models of virus dynamics.- Chapter 10. Virus dynamics in humans: unstable directions and order parameters.