Abstract
A constituent parton picture of hadrons with logarithmic confinement naturally arises in weak coupling light-front QCD. Confinement provides a mass gap that allows the constituent picture to emerge. The effective renormalized Hamiltonian is computed to $O({g}^{2})$, and used to study charmonium and bottomonium. Radial and angular excitations can be used to fix the coupling $\ensuremath{\alpha}$, the quark mass $M$, and the cutoff $\ensuremath{\Lambda}$. The resultant hyperfine structure is very close to experiment.
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