The technique for applying a Merk-Chao series expansion to boundary layer problems has been adapted and extended to mixed convection flow over two-dimensional and axisymmetric bodies. This technique involves a double perturbation expansion about a local similarity state. The resulting ordinary differential equations are then amenable to solution via a shooting method. The resulting universal functions are independent of geometry and are tabulated with respect to the two mixed convection parameters. The method was adapted to steady, laminar incompressible flow over isothermal surfaces. The resulting momentum and energy equations, as do their solutions, correctly reduce to both limits -pure forced and natural convection. The general results obtained were then applied to evaluate specific cases. Favorable comparisons were made to literature studies for the inclined plate, horizontal cylinder and sphere. A pair of correlations is presented for the inclined plate relating a friction factor group and a Nusselt number group to a convection ratio.