  Guided by the observed properties of hadrons I formulate a perturbative bound
state method for QED and QCD. The expansion starts with valence Fock states
($e^+e^-,\ q\bar q,\ qqq,\ gg$) bound by the instantaneous interaction of
temporal gauge ($A^0=0$). The method is tested on Positronium atoms at rest and
in motion, including hyperfine splitting at $O(\alpha^4)$, electromagnetic form
factors and deep inelastic scattering. Relativistic binding is studied for QED
in $D=1+1$ dimensions, demonstrating the frame independence of the DIS electron
distribution and its sea for $x_{bj} \to 0$. In QCD a homogeneous solution of
Gauss' constraint in $D=3+1$ implies $O(\alpha_s^0)$ confining potentials for
$q\bar q,\ q\bar qg,\ qqq$ and $gg$ states, whereas $q\bar q\,q\bar q$ is
unconfined. Meson states lie on linear Regge trajectories and have the required
frame dependence. A scalar bound state with vanishing four-momentum causes
spontaneous chiral symmetry breaking when mixed with the vacuum.
  These lecture notes assume knowledge of field theory methods, but not of
bound states. Brief reviews of existing bound state methods and Dirac electron
states are included. Solutions to the exercises are given in the Appendix.
