Stephane Courteau Associate Professor Queen's University Title: Puzzles in Galaxy Scaling Relations ABstract: Spiral galaxies exhibit global correlations between their total luminosity, maximum circular velocity, and disk scale length that pose a fundamental challenge to standard models of structure formation. On local scales, galaxy scaling relations that include velocity dispersion estimates (such as the M_BH-sigma and the Vcirc-sigma relations) are also challenging to both structure formation and galaxy dynamics models. I will discuss recent derivations of global and local galaxy scaling relations and our attempts to understand them.