The merger of law firms Allen & Overy from the UK and Shearman & Sterling from the US in a $3.4bn deal will not be easy to complete or deliver. Ben de Haldevang, Abhay Pande, David Boyd and Paul Siegenthaler from The Agile Gorilla collective talk about the challenges of merging professional services firms, especially those with a large number of partners. We talk about what the benefits of the deal look like, and how to achieve them.