  We review the recent results on the Jacobi field of a (real-valued) L\'evy
process defined on a Riemannian manifold. In the case where the L\'evy process
is neither Gaussian, nor Poisson, the corresponding Jacobi field acts in an
extended Fock space. We also give a unitary equivalent representation of the
Jacobi field in a usual Fock space. This representation is inspired by a result
by Accardi, Franz, and Skeide (2002).
