Since binary pulsars represent a natural laboratory for testing relativistic field theories, it was interesting to study the problem of two bodies, in a strong field regime. Hence, this book is not only a complete review of the work done on binary pulsars but also, it includes an important step towards a more general solution to the problem of the strong field of two bodies; which is still far beyond the reach of researchers. This is done by modifying Curzon solution to describe the field of binaries. A more general formula for red-shift and Shapiro time delay were derived including...