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Alexander Gerst

Alexander Gerst was born in Künzelsau, Germany, on 3 May 1976. He has a background as a geophysicist and volcanologist and has served two six-month missions on the International Space Station – Blue Dot in 2014 and Horizons in 2018. During his Horizons mission, Alexander became the first German and second European commander of the International Space Station.



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.

Alexander was the first of ESA’s class of 2009 astronauts to travel space for a second time. He returned 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. Read more about Alex and his Horizons mission at

Parallel to his training proficiency duties as a member of the European astronaut corps, Alexander is currently assigned to ESA’s technical centre ESTEC in the Netherlands. There he works with spacecraft engineers on the technical aspects of ESA’s future human and robotic exploration missions, including the next steps towards the Moon, the Lunar Gateway Project, and the future of ESA’s human presence in Low Earth Orbit.

When Alexander is not in space or training for his next mission, his favourite sports include fencing, swimming and running. He especially enjoys outdoor activities such as skydiving, snowboarding, hiking, mountaineering, climbing and scuba diving.

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ESA missions


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. In 2018 he returned to space for his second mission called Horizons where he held the role of International Space Station Commander for Expedition 57. Alexander is a geophysicist and volcanologist.

Total days in Space


Alexander Gerst

Closing the loop on Space Station science

Scientist in ESA’s Human Spaceflight programme Elizabeth Heider shares her experiences of a recent science debrief with ESA astronaut Alexander Gerst following the 2018 Horizons mission. The version below has been edited for length. See the full article on LinkedIn.

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Alexander Gerst

Return to Star City

ESA astronaut Alexander Gerst returned to Star City, Moscow, this week where he attended a traditional welcome home ceremony alongside NASA astronaut Serena Auñón-Chancellor and Russian cosmonaut Sergei Prokopyev at the Yuri Gagarin Training Center (GCTC).

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Alexander Gerst

Back to Earth – crew support

From coordinating the development of space food to accompanying astronauts into quarantine and managing family travel budgets, the role of crew support at ESA is never boring. Unit lead Romain Charles describes it as: “facilitating the daily lives of astronauts so they can focus on their missions”. We asked the team to tell us more about this vital and varied role.

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Alexander Gerst

Alexander’s second ride back to Earth

After six months in space ESA astronaut Alexander Gerst, NASA astronaut Serena Auñón-Chancellor and Roscosmos cosmonaut Sergei Prokopyev returned home from the International Space Station.

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