With important contributions from many Williams undergraduates over recent years, we have completed a series of high-precision spectroscopic measurements in Group III and IV atoms such as thallium, indium and lead. These results test state-of-the art theoretical models of these multi-valence atoms and guide further refinement. I will discuss some recent results including atomic beam / polarizability measurements and will focus on precision measurements of lead transition amplitudes which makes use of a Faraday polarimetry technique that has its roots in the Fortson atomic physics group at UW. Improved models of these heavy, multi-valence atoms aid in the bigger goals of testing the Standard Model (and beyond) with table-top atomic and laser physics experiments.