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Explore the spin characteristics of binary black holes (BBHs) that originate from post-stable-mass-transfer binary systems in this 15-minute conference talk. Examine how gravitational wave detections are transforming our understanding of stellar mass black hole populations, while Gaia observations reveal dormant black holes in detached binaries and microlensing studies probe isolated black holes. Learn about the complex lifecycle of stellar black holes, from their massive star progenitors through core collapse and associated transients, to their evolution as dormant or accreting objects and potential merger as gravitational wave sources. Discover how recent findings from time domain surveys searching for black hole birth transients and stellar companion interactions are revealing new populations that complement traditional X-ray and radio survey discoveries. Understand the theoretical and observational strategies being developed to address critical questions about stellar black hole evolution, particularly focusing on the spin properties of binary black holes formed through specific evolutionary pathways involving stable mass transfer phases.
