The Carnegie Hubble Program

The Carnegie Hubble Program is a Warm Spitzer program designed to measure the
Hubble constant to an accuracy of 3%. I will discuss the details of the
program - from the Galactic Cepheid calibration to the Tully Fisher relation,
emphasising how the unique properties of Spitzer make it ideal for a task such
as this. I will introduce our new Spitzer program - the Carnegie RR Lyrae
Program - discussing how it complements the CHP in terms of the time scales
and objects studied.