Thomas Liehr is working in human genetics since 1991. He is biologist by education and head of the molecular cytogenetic group in Jena, Germany. Research fields include clinical genetics, leukemia cytogenetics and interphase structure of human chromosomes. The results of his research are published in >10 books, ~100 book chapter, ~800 referred papers, and ~1000 abstracts. His particular expertise includes small supernumerary marker chromosomes (sSMC), chromosomal heteromorphisms and uniparental disomy - see ChromosOmics databases (http://cs-tl.de/DB.html). He is active member of the European Board of Medical Genetics and received multiple prices, two invited professorships and a Dr.h.c. as summarized at http://cs-tl.de/.