Astrophysicist Deborah Dultzin Kessler passed away on April 1, 2026, at the age of 81. Introduction Deborah Dultzin Kessler was a Mexican astrophysicist, professor, and researcher dedicated to quasars, blazars, active galactic nuclei, and supermassive black holes. She was regarded as a pioneer in the study of these extreme objects in Latin America. Her work contributed to a better understanding of the most energetic phenomena in the universe. Scientific Career Dultzin Kessler was born on January 1, 1945, in Monterrey, Mexico. She built an international academic career and later brought that knowledge back to Mexico, where she played an important role in the further development of astrophysics. Her education took place at prestigious institutions both domestically and abroad. She earned a master's degree in astrophysics from Moscow State University. In 1986, she earned her doctorate from Sorbonne University with a thesis on spectrophotometry of active galactic nuclei. Spectrophotometry is a technique that astronomers use to analyze light in order to measure properties of distant objects. In the case of active galactic nuclei, it involves the bright regions around supermassive black holes at the centers of galaxies. Research in this area helps explain how such black holes attract matter and emit enormous amounts of energy. At the Institute of Astronomy of the National Autonomous University of Mexico (UNAM), she worked as a professor and researcher. There, she focused on quasars and blazars, objects that are among the brightest in the universe. By studying these phenomena, scientists could better understand how supermassive black holes influence their surroundings, similar to how a powerful engine drives an entire system. Specialization in quasars, blazars, active galactic nuclei, and supermassive black holes Master's in astrophysics from Moscow State University PhD in 1986 from Sorbonne University, researching spectrophotometry of active galactic nuclei Professor and researcher at the Institute of Astronomy of UNAM Honored with the National University Award from UNAM in 2016 According to available information, she was one of the scientists who made a visible contribution to the international astrophysical community from Mexico. Her work helped establish the Institute of Astronomy at UNAM as a recognized center for astrophysical research in Latin America. She also played a role in training young researchers and strengthening international collaboration. The award she received in 2016, the National University Award from UNAM, is considered one of the highest honors for research and education in Mexico. This prize underscored her significance as a scientist and educator. In a field long dominated by men, she was also a visible role model for new generations of astrophysicists. Private Life Little is publicly known about Deborah Dultzin Kessler's private life. It is known that she held Mexican nationality and was born in Monterrey. Further personal details have not been publicly confirmed. Passing Deborah Dultzin Kessler died on April 1, 2026, at the age of 81. The place of death has not been disclosed. No public information about the cause of death is available. Public reactions from universities, research institutes, or colleagues have not been confirmed based on the provided information. However, it is certain that her passing is a loss for astrophysics in Mexico and for research into active galactic nuclei. Conclusion With the death of Deborah Dultzin Kessler, astrophysics loses a respected researcher and educator. Her work on quasars, blazars, and supermassive black holes has deepened the understanding of some of the universe's most powerful processes and helped put Mexican astrophysics on the international map. Her scientific legacy lives on in the research she helped enable and in the researchers she inspired. On Overleden.net, you can find more notable deceased individuals from the scientific community. This article was prepared with the support of AI tools and verified by the editorial team of Overleden.net.