Anton Zensus

Director at the Max-Planck-Institute for Radio Astronomy


I am Director at the MaxPlanck Institute for Radio Astronomy.  My research department  is specialised in the technique called Very Long Baseline Interferometry (VLBI). We study active galaxies thought to harbour massive black holes in their innermost regions. 

I serve in leading roles in the organisation and management of the Event Horizon Telescope Collaboration and other large international scientific collaborations.

I train young scientists and I support the next generation of research leaders as a mentor and coach.

I engage in the public discourse as expert and keynote speaker.

I have led in the organisation and management of large international scientific collaborations:

EHT Event Horizon Telescope Collaboration – Board Chair 2017-2020 and Interim Board Chair since 2015

RadioNet, a project funded by the European Union under Horizon 2020 – Coordinator

ORP OPTICON-RADIONET Pilot, a project funded by the European Union under Horizon 2020 – Scientific Coordinator

IMPRS International Max-Planck-Research School (IMPRS) for Astronomy and Astrophysics, at the Universities of Bonn and Cologne – Founding Director and Speaker since 2002

EVN Board of Directors of the European VLBI Network – past Chair Board of Directors

JIV-Eric Joint Institute for VLBI European Research Infrastructure – Council member and Past Chair of the JIVE Board

ISSC International SKA Steering Council and SSEC SKA Science and Engineering Council

GLOW German Long Wavelength Consortium – Founder and past Chair

RISC RadioAstron International Science Council

VSOP VLBI Space Observatory Programme – Past Chair International Science Council

Radio astronomy and very long baseline interferometry

Galaxies and black holes

Scientific and organisational evaluation

Mentoring for high-potential starting research leaders

Coaching for scientific and executive leaders

Public lecturer and keynote speaker

Physics and astronomy in Cologne and Münster – Doctorate in 1984

Postdoctoral Researcher at the California Institute of Technology (Caltech) and National Radio Astronomy Observatory (NRAO) 1985-1991

Basic Research Staff Scientist at NRAO since 1991 and tenure from Associated Universities 1996; Adjunct Scientist since 1997

Scientific Member of the Max Planck Gesellschaft and Director at the Max Planck Institute for Radio Astronomy since 1997

Professor (hon.) – University of Cologne Institute for Astrophysics since 2005

Advanced Grant Award – European Research Council 2021

Founding Chair of the Board – Event Horizon Telescope Collaboration 2020

Breakthrough Prize for Fundamental Physics 2020, with the Event Horizon Telescope Collaboration

Bruno Rossi Prize 2020, Einstein Medal 2021,  Group Award of the Royal Astronomical Society 2021, with the Event Horizon Telescope Collaboration (more awards here)

Golden Medal – Institute of Applied Astronomy St. Petersburg 2013

RadioAstron Bronze Medal – Astro Space Center Moscow 2010

Max-Planck-Forschungspreis 1999

Alexander-von-Humboldt Forschungspreis 1994

Studienstiftung des Deutschen Volkes 1982


With my team of astronomers at the Max Planck Institute for Radio Astronomy I study the jets and cores of galaxies in the Universe, which harbour massive Black Holes. We use sensitive radio telescopes around the World and in Space and we are major contributors in the Event Horizon Telescope (EHT) Collaboration, which made the first image of a Black Hole.

The central tool for our research is the specialised astronomical technique called Very Long Baseline Interferometry. This connects radio telescopes thousands of kilometers apart. VLBI achieves the highest imaging resolution by observing at the shortest radio wavelengths and with antennas in space. 

We have steadily been advancing this research method to new limits for over thirty years, and along the way we made a steady stream of astronomical discoveries about active galaxies and their central nuclei.

My group operates one of the World’s most powerful VLBI correlation centers. It combines and analyses the data from radio telescopes all over the World and in Space.

We develop cutting edge technology and software for current and future VLBI applications.

These advances in sensitivity and imaging resolution were crucial steps for the Event Horizon Telescope (EHT), which was used to image for the first time a supermassive Black Hole in the centre of the galaxy M87. 

My research is published in the professional astronomical literature. Recent results are available as preprints before publication.

Astronomy at Highest Resolution


Global Science

Together with my group and our partner institutions around the World we have been developing Very Long Baseline Interferometry at millimeter waves since 1994 and we are key contributors to the Event Horizon Telescope (EHT) Collaboration, which in 2019 published the first image of a Black Hole.

The image of the black hole in M87, made possible only through a world-wide collaboration, is widely considered one of the most important scientific results of the decade.  Estimated more than one billion people have seen the image and the EHT Collaboration received the 2020 Breakthrough Prize 2020 for this achievement.

I lead my science and R&D teams on par with the world class research groups in the Event Horizon Telescope Collaboration. At the same time I hold responsibility for the whole collaboration of several hundred scientists in the Collaboration Board, which I founded in 2017, following nearly a decade of preparation.

I have been the Coordinator of RadioNet. With national and European Union funding, the premier radio astronomy facilities in Europe – telescopes and development laboratories – collaborate in this EU Horizon 2020 project.
They offer trans-national access to observatories and pursue technical development and networking activities.

The GMVA offers peer-reviewed observing opportunities for all scientists to VLBI observations at 3mm.

The MPIfR is a founding member of the European VLBI network and the Effelsberg radio telescope is the centerpiece of the array since 1984.

The Russian satellite made possinble VLBI observations with baseline lengths of almost the distance of Earth to Moon and it gave an unprecedented opportunity for astronomical observations with extreme resolution.


I believe in giving back to society and the scientific community through training and fostering young scientists. As mentor and trained coach I support high-potential starting scientific leaders, sharing with them my experience as a scientist, head of a world-class research department and leader in international scientific endeavours. At the same time I personally greatly value the opportunity to learn and benefit from their own wide ranging experiences and perspectives.

I serve as a mentor in the Elisabeth-Schiemann-Kolleg for female research leaders on the way to top positions and I offer mentoring in the Mentoring Programme of the Deutsche-Gesellschaft der Humboldtianer.

Starting and experienced research group leaders alike may at times face fairly common challenges in leadership. These can arise from the transitioning from individual  research to leading their own  research group, from struggling to balance competing for a future top level appointment and personal life, or from simply dealing with difficult people or environments.

I am convinced that Coaching, even as a short-term intervention, can be helpful in such a situation. I highly recommend you consider working with an experienced Coach if this resembles your own situation.

Over the years, in my own work with individuals, teams and large distributed and diverse collaborations, I realized the desire to become better equipped to support the people under my stewardship. That led me to complete professional training as a certified systemic coach. This has profoundly widened my perspective on leadership, management and mentoring.

Today, in my own work leading and supporting individuals or teams I am dedicated to a professional principle-based and person-centric approach, and I am convinced that makes for better leadership.

Individuals associated with the Max Planck Society, in astrophysics or in other fields especially in the natural sciences, may contact me about mentoring or coaching at

All other inquiries from individuals or organizations interested in working with me as speaker, consultant or coach may be sent to

Promoting Talent

Talking About Science

Public Talks

In my public lectures I explain our complex scientific research results to non-experts. („As simple as possible but not simpler“). I tell my stories of scientific discoveries and shares with my audience my personal experience as researcher and scientific leader.

As a keynote speaker I place my international experience in managing basic research and in the training of the next generation of researchers into the contexts of society and business.

Contact me with inquiries about scientific colloquia and lectures at universities, research institutes or conferences, public talks, interviews or media productions at

All other inquiries from individuals or commercial organizations interested in working with me as speaker, consultant or coach may be sent to

Join the Team

I encourage and welcome postdoctoral researchers to join ongoing experimental and theoretical projects in my department, e.g., with the Event Horizon Telescope, the Global Millimeter VLBI Array, the European VLBI Network and our radio telescopes.. They may naturally  combine this with their their own independent research projects.

If you are a interested in a postdoctoral research position with me, please write to or look for current postings below.

In my research group at the MPIfR, doctoral students work on their dissertations, individually guided by experienced scientific mentors, and with 3-year funding from the Max-Planck-Society. I founded the International Max Planck Research School for Astronomy and Astrophysics at the Universities of Bonn and Cologne in 2002. This provides a stimulating and fostering environment for a diverse international group of students, with access to world-class research facilities.

Research projects for students working on their Master’s thesis are supervised by experienced scientists in my group. Hourly work contracts as „Studentische Hilskraft“ are available for eligible and qualified students.

Send inquiries for working with us for your Master‘s thesis to Prof. Eduardo Ros at

The Max Planck Society and its institutes are committed against any sort of discrimination of individuals for any reasons.  The MPG has a comprehensive set of provisions to foster a diverse, multi-cultural and inclusive environment.

Violations are not tolerated and will be appropriately addressed. Criticisms and complaints may be raised anonymously and they will be followed up.

All employees are bound to abide by a society-wide code-of-conduct, rules of scientific conduct as well as Germany’s comprehensive relevant national legislation. Employee training relevant to this topic is available. There is an ombuds system for scientific conduct issues, and comprehensive nationally governed worker‘s protection.

As Director I am committed to ensure for researchers and any staff that the department is enabling top-class research and maintaining a collegial,  fair, safe and supporting working atmosphere. 

I welcome and support personal professional development and specific measures, such as individual leadership development or soft skills and intercultural training  for doctoral candidates.

I have been guiding since 2018 an institute-wide project, which conducted an employee climate and physical/mental health survey. This was useful in identifying areas for improvements regarding physical and mental well being.

I also guided the development of an equal opportunity plan for the MPIfR.

All doctoral students in my group have an experienced scientist guiding their research and a thesis committee, normally including myself as examiner and other experts. The institute provides comprehensive full access to employee protection provisions, at all times.

All postdoctoral researchers have regular opportunities with group leadership to discuss career aspects and concerns.