| Abstract: For nearly 20 years, space based gamma-ray observations from the Fermi Gamma-ray Space Telescope and the Neil Gehrels Swift Observatory have revolutionized our understanding of the universe. They have revealed the explosive death of stars, the creation and evolution of black holes at all scales, and ushered in a new era of observing the universe with particles and gravitational waves. Any big discovery yields more deeper questions. Questions that can only be answered by the next generation of gamma-ray telescopes. In this talk, I will briefly overview some key science topics that have been addressed by Fermi and Swift, the questions that have come out of these observations, and how the space-based gamma-ray community is planning for future observatories including upcoming missions and mission concepts. |