Weighted norm inequalities for singular integrals have received much attention in recent years. Via local mean oscillation, Andrei Lerner was able to bound Calderon-Zygmund operators in norm by positive dyadic operators. I will focus on how the innovative techniques of Lerner have led to new results in the area of sharp weighted norm inequalities for Calderon-Zygmund operators and will also introduce how a reverse Holder extrapolation technique is useful in proving two-weighted bounds.