Speaker
Description
Active Galactic Nuclei (AGN) serve as some of the universe's most powerful and extreme cosmic accelerators. Over the past several decades, our understanding of these objects has evolved from early taxonomic classifications into a coherent framework driven by broad multi-wavelength surveys. Today, the advent of next-generation instrumentation for high-energy photon and neutrino astronomy is pushing this paradigm into a new era. In this talk, I will present recent highlights from AGN observations in the gamma-ray band, drawing from current space-borne and ground-based facilities like Fermi-LAT and MAGIC, H.E.S.S. and VERITAS, while looking forward to the transformative capabilities of the Cherenkov Telescope Array Observatory (CTAO). I will particularly report on some insights gained from extensive, multi-decade, multi-instrument monitoring campaigns of a select group of bright, nearby blazars. These coordinated observations reveal a staggering complexity in the temporal evolution of broadband emission and expose distinct flavors of flaring activity across different epochs. Ultimately, these long-term datasets underscore the absolute necessity of continuous, multi-wavelength, and multi-messenger monitoring to fully decode the intrinsic particle acceleration mechanisms and dynamic environments of jetted AGN.