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The Herwig event generator has been used in the planning and data analysis of high energy physics experiments for the past twenty years. Following a major rewrite, the current version simulates lepton and hadron collisions including: careful modeling of parton showers, including coherence effects; a detailed model of the underlying event; several processes accurate at next-to-leading order; simulation of a range of BSM models with spin correlations; a detailed model of hadron and tau decays.

The next major release will include further next-to-leading order processes and the matching of leading-order processes to higher multiplicity matrix elements in an improvement to the original approach of Catani, Krauss, Kuhn and Webber (CKKW). In the longer term we will continue our emphasis on state-of-the-art simulation of perturbative physics.