After his PhD in Physics, Andreas Seifert dedicated his career to optics and photonics. In brief: From space telescopes over optical microsystems to nanophotonics. First, he worked for many years in leadership positions in Optical Industry at Carl Zeiss, Germany, and from 2007 at the University of Freiburg, Germany, as Group Leader in the field of Microsystems Engineering, in particular Medical Optical Microsystems. In 2015 he joined CIC nanoGUNE as Ikerbasque Research Professor and Group Leader in Nanoengineering. Current research combines nanotechnology with photonics, primarily with applications in the fields of medical diagnostics, food control and environmental monitoring.