This talk consists of two parts both dealing with high-redshift star
formation and its effect on the environment. First I will present our
recent results on the escape fractions of UV photons from young
protogalaxies based on first principle calculations of star formation
and radiative/mechanical feedback. These results match very well
recent observational estimates of the high-z escape fraction. Next I
will talk about our effort to reproduce kinematic properties of damped
Lyman-alpha systems and the role star formation might play in this. I
will also talk about the push to do coupled radiation hydrodynamics
modeling of early galaxy/star formation.