Karsten Danzmann becomes Director Emeritus
Celebratory colloquium for the founding director of the Max Planck Institute in Hannover
For more than three decades, Karsten Danzmann has been a leading figure in international gravitational-wave astronomy. The professor at the Institute for Gravitational Physics at Leibniz University Hannover and director at the Max Planck Institute for Gravitational Physics (Albert Einstein Institute, AEI) has played a central role in advancing major projects for gravitational-wave observation on Earth and in space. On 1 April 2026, he will retire from the university and become Director Emeritus at the AEI. To mark this occasion, his achievements will be honored with two commemorative lectures on 31 March and 1 April.
“I consider it a great privilege that the new generation of scientists, whose development I had the privilege of supporting as director, is now playing a key role in driving the development of future detectors such as the Einstein Telescope and the LISA mission worldwide,” says Karsten Danzmann, who has been a professor at Leibniz University Hannover since 1993 and was appointed in 2002 as the first director at the Hannover branch of the Max Planck Institute for Gravitational Physics (Albert Einstein Institute). He adds: “As director emeritus, I will continue to support these future projects in gravitational-wave astronomy and intend to contribute my many years of experience in managing large-scale international projects.”
Commemorative lectures
To mark Karsten Danzmann’s retirement, two of his long-time scientific colleagues will give two commemorative lectures, who will reflect on his contributions to gravitational-wave astronomy.
Bernard Schutz, founding director of the AEI in Potsdam, will speak on 31 March at 16:30 CEST on “Where Gravitational-wave Astronomy would be today without Karsten Danzmann: Nowhere!”. This lecture will take place as part of the Mathematics and Physics Colloquium at Leibniz University Hannover in the Great Physics Hall (E214).
Stefano Vitale, former professor at the University of Trento, will speak on 1 April at 14:00 CEST on “How Karsten Danzmann got us LISA” at the AEI Hannover Colloquium (room 103).
Following in Einstein’s footsteps with GEO600
For 36 years, gravitational waves, which Albert Einstein predicted in 1916, have been the focus of Danzmann’s research. After earning his doctorate in 1980, his work initially focused on other topics: atomic and molecular physics and spectroscopy. In 1990, Danzmann – who was an acting assistant professor at Stanford University at the time – took over the leadership of the gravitational-wave project from Heinz Billing at the Max Planck Institute for Quantum Optics in Garching.
Three years later, he accepted a professorship at Leibniz University Hannover, where he set up the GEO600 gravitational-wave detector in partnership with colleagues from the UK. GEO600 is the technology hub of international gravitational-wave research and has achieved important technological breakthroughs that are now standard in all major gravitational-wave detectors. These technological developments played a key role in the LIGO detectors’ first direct detection of gravitational waves from merging black holes in the fall of 2015, an achievement that was awarded the Nobel Prize in Physics in 2017. These technologies now enable large detectors such as LIGO and Virgo to detect mergers of black holes or neutron stars in the depths of the cosmos on average every few days. Since the summer of 2024, GEO600 has been breaking new ground by working on the search for very high frequency gravitational waves, looking for entirely new sources that other instruments do not observe.
Danzmann’s work on the GEO600 gravitational-wave detector had a Europe-wide impact. While GEO600 was still under construction, he and other researchers began conceptualizing a new generation of ground-based gravitational-wave detectors in Europe. In 2000, Danzmann provided a key impetus with a plenary lecture at the 9th Marcel Grossmann Meeting in Rome, in which he presented the principal foundations for a significantly more sensitive observatory. Many considered the idea too futuristic at first, but it gained support across Europe in the following years and evolved into the mature Einstein Telescope project. This planned observatory is a flagship European scientific project that will open up entirely new avenues for exploring the universe.
Into space with LISA
At the same time, starting in 1993, Danzmann advanced the development of the space-based gravitational-wave observatory LISA (Laser Interferometer Space Antenna), which is now on track for its launch into space in the mid-2030s. Between 1993 and 2011, Danzmann served first as spokesperson for the LISA Study Team and then as mission scientist for LISA at the European Space Agency (ESA). Starting in 2011, he led the international LISA consortium, which formulated and developed the mission’s scientific concept. In 2024, ESA’s Science Programme Committee confirmed that the LISA concept was mature. This marked the beginning of the mission’s construction phase, with a launch planned for about a decade from now.
LISA will be the first gravitational-wave observatory and discovery mission in space. Starting in the 2030s, it will work hand in hand with other observatories to gather entirely new information about the dark, invisible side of the universe. LISA consists of three satellites that form a triangular detector with 2.5-million-kilometer-long arms of laser light, that follows Earth in its orbit around the Sun. The satellites will use their lasers to measure changes in distance caused by gravitational waves between test masses in free fall within the satellites. LISA will study lower-frequency gravitational waves that cannot be observed from the ground.
Paving the way for LISA
The LISA Pathfinder mission, conducted between 2015 and 2017, demonstrated that LISA’s key technologies work, thereby paving the way for the large observatory. Starting in 2004, Karsten Danzmann served as co-principal investigator of the ESA satellite mission, accompanying it throughout its entire “lifetime”: from initial conception to development, construction, launch, and ultimately, deactivation following its extremely successful mission in the summer of 2017.
He served as deputy spokesperson for Transregio 7 in Jena, which contributed to the establishment of a Germany-wide scientific community in gravitational wave physics. At Leibniz University Hannover, he served as the spokesperson for one Collaborative Research Center and as co-spokesperson for another, thereby shaping key research structures within the field. Additionally, he was the initiator and first spokesperson for a Cluster of Excellence and played a decisive role in securing its successful approval. Within these programs, technologies from the LISA context were further developed and applied to geodetic satellite missions.
Another focus was the International Max Planck Research School (IMPRS) on Gravitational-Wave Astronomy, which launched in 2006 as one of the early IMPRS programs and ran until 2023. Approximately 170 doctoral students were trained within this framework; many of them now hold leading positions in gravitational-wave research.
Background information
Half a Century in Physics
Karsten Danzmann obtained a degree in physics at the University of Hanover in 1977, where he completed his doctorate in physics in 1980. After a period as a visiting scientist at Stanford University from 1982 to 1983, he then worked as a research assistant at the Physikalisch-Technische Bundesanstalt in Berlin until 1986. In 1986, he returned to Stanford University as acting assistant professor of physics before joining the Max Planck Institute of Quantum Optics in Garching as project leader in the field of gravitational waves in 1990. In 1993, he was appointed professor at the University of Hanover and has since headed the Institute for Gravitational Physics there. Since 2002, he has been also been a director at the Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Hanover branch.
Outstanding Research
Karsten Danzmann has received numerous awards for his pivotal contributions to the first direct observations of gravitational waves and for paving the way for future observatories. These include, among others, an honorary doctorate from RWTH Aachen University in 2025, the Körber Prize for European Science in 2017, the Otto Hahn Prize in 2017, the Stern-Gerlach Medal from the German Physical Society in 2018, the 2018 Edison-Volta Prize from the European Physical Society, induction into the German Research Hall of Fame in 2019, the 2016 Lower Saxony State Prize (shared with B. Allen and A. Buonanno), and several awards received jointly with the LIGO Scientific Collaboration. Danzmann is also a member of the Mainz Academy of Sciences and Literature, a Fellow of the American Physical Society, and a member of the Hamburg Academy of Sciences.
