This is based on the papers by Mariusz UrbaƄski and Anna Zdunik The finer geometry and dynamics of some meromorphic functions, Real analyticity of Hausdorff dimension of finer Julia sets of exponential family. I would like to show how they proved Bowen's Formula for hyperbolic exponential maps, i.e. the Hausdorff dimension of the set of points from the Julia set which do not escape to infinity is the zero of the pressure.