  We employ the method of nonlocal generalized Sundman transformations to
formulate the linearization problem for equations of the generalized Li\'enard
type and show that they may be mapped to equations of the dissipative
Ermakov-Milne-Pinney type. We obtain the corresponding new first integrals of
these derived equations, this method yields a natural generalization of the
construction of Ermakov-Lewis invariant for a time dependent oscillator to
(coupled) Li\'enard and Li\'enard type equations. We also study the
linearization problem for the coupled Li\'enard equation using nonlocal
transformations and derive coupled dissipative Ermakov-Milne-Pinney equation.
As an offshoot of this nonlocal transformation method when the standard
Li\'enard equation, x + f(x)x_ + g(x) = 0, is mapped to that of the linear
harmonic oscillator equation we obtain a relation between the functions f(x)
and g(x) which is exactly similar to the condition derived in the context of
isochronicity of the Li\'enard equation.
