Alexei Erko received PhD degree in experimental physics (1981) from the Moscow Physical-Engineering Institute, Habilitation in Physics in 1991 and Professor in experimental physics in 1992. From 1978 to 1994 worked as Senior Scientist and later as a Head of Laboratory at the Institute of Solid State Physics and Institute of Microelectronics Technology Russian Academy of Sciences (Chernogolovka). Since 1994 he has a position of Senior Scientist at BESSY GmbH, Berlin, Germany. Research interests include x-ray optics, x-ray holography and synchrotron radiation beamlines design.