John Bally of the University of Colorado at Boulder is the guest speaker for the NRAO Colloquium. Bally will present “Stellar Feedback and the Ecology of the Galactic ISM.” He will discuss how large-scale surveys of the Milky Way complemented by high-resolution studies of small fields are revolutionizing the understanding of the Galactic Interstellar Medium (ISM) and star formation. He will describe the feedback ladder – a chain of increasingly powerful mechanisms that may be responsible for the Galactic ecology. All NRAO employees are invited to attend via video. Hosted by Miller Goss. 11 a.m. in the Domenici Science Operation Center.