Alexander Gerst is a European Space Agency (ESA) astronaut. In 2014 he spent six months on the International Space Station for ESA’s Blue Dot mission. On 20 December 2018, he has returned from his second mission called Horizons where he served as Station commander for Expedition 57. Alexander is a geophysicist and volcanologist.

Alexander Gerst

ESA Astronaut Alexander Gerst. Credits: ESA/NASA.

Personal data

Alexander Gerst was born in Künzelsau, Germany, on 3 May 1976. His favourite sports are fencing, swimming and running. He especially enjoys outdoor activities such as skydiving, snowboarding, hiking, mountaineering, climbing and scuba diving.


Alexander graduated from the Technical High School in Öhringen, Germany, in 1995.

In 2003 he received a diploma in geophysics from the University of Karlsruhe, Germany, and a master’s degree in Earth sciences from the Victoria University of Wellington, New Zealand. Both degrees were awarded with distinction.

In 2010 Alexander graduated with a Doctorate in Natural Sciences from the Institute of Geophysics of the University of Hamburg, Germany. His dissertation was on geophysics and volcanic eruption dynamics.


Alexander is a member of:

  • The International Association of Volcanology and Chemistry of Earth’s Interior (IAVCEI)
  • The German Geophysical Society (DGG)
  • The European Geosciences Union (EGU)
  • The European Volcanological Society (SVE)
  • The American Geophysical Union (AGU)


During his school years, Alexander volunteered as a Boy Scout leader, fire-fighter and water rescue lifeguard. As a student, from 1998 to 2003, he participated in various international scientific collaborations and field experiments. Several of these expeditions led him to remote locations such as Antarctica where he installed scientific instruments.

Between 2001 and 2003, while researching his master’s thesis on a volcano in New Zealand, Alexander developed new volcano monitoring techniques that may improve volcanic eruption forecasting. The results were published in Science Magazine.

Alexander worked on developing scientific instruments at the Institute of Geophysics at the University of Hamburg between 2004 and 2009.

From 2005 to 2009, while at the Institute of Geophysics, he also worked towards his doctorate, investigating volcanic eruption dynamics on active volcanoes. His research goal was to determine the mechanics and the energy released during the first seconds of a volcanic eruption. His research led him to visit volcanoes on all continents, concentrating on an active volcano in Antarctica. In 2007 Alexander received the Bernd Rendel award for outstanding research from the DFG German Research Foundation.

After being selected as an ESA astronaut candidate in May 2009, Alexander officially joined ESA in September 2009 and completed Astronaut Basic Training in November 2010.


In September 2011, Alexander was assigned to fly to the International Space Station on a six-month mission serving as a flight engineer on Expeditions 40 and 41. He was launched on a Soyuz spacecraft from Baikonur Cosmodrome in Kazakhstan in May 2014 and returned to Earth in November 2014. This mission was known as Blue Dot and saw Alexander work on a comprehensive programme of European and international science in space.

In May 2017 Alexander’s second mission, Horizons, was announced, as well as his assignment to the role of International Space Station Commander for Expedition 57. Alexander is the first of ESA’s class of 2009 astronauts who travelled to space for a second time. He flew to the International Space Station on Soyuz MS-09, together with NASA astronaut Serena Auñón-Chancellor and Russian spacecraft commander Sergei Prokopyev, on 6 June 2018 and returned to Earth on 20 December 2018.

Alexander is currently serving as commander on board the International Space Station and is the second ever European astronaut to hold this role.