Nucleon structure in a relativistic quark model

We study nucleon structure in the relativistic quark model based on the Bakamjian-Thomas construction of the Poincaré generators for an arbitrary quantization surface. The one body, single particle approximation to the current operators is used to calculate electromagnetic matrix elements. The Lorentz symmetry breaking resulting from such an approximation is fully investigated. The results for the light front and instant quantization limits are detailed. A suggestion for the resolution of the quark model inability to simultaneously describe the positive neutron electric form factor, ${\mathit{G}}_{\mathit{E}}^{\mathit{n}}$(${\mathit{Q}}^2$) at small ${\mathit{Q}}^2$ and the negative slope of the neutron to proton structure function ratio at large x is presented.