Johan Kleyn is admitted to the Bar of Amsterdam. He specializes in public and private mergers and acquisitions, both in negotiated and contested transactions, corporate litigation and boardroom counselling. He has acted for issuers and underwriters in public takeovers and public offerings and is also active in the private equity field. Johan is a corporate litigator and boardroom counselor. 

Johan is a Senior Counsel at Hogan Lovells, and is a non-executive member of listed and non-listed companies.

In various editions of Chambers he is described as "a very creative driving force"  and in Mergers & Acquisitions he was frequently named as one of the three best M&A lawyers if the Netherlands. Johan is a frequent speaker at conferences on topics relating to his area of expertise.

Johan has acted for a number of listed companies in connection with (un)friendly takeovers including for ABNAMRO, Westfield in connection with the takeover of Rodamco North America, for Cryo Save and Fairstar in connection with Dockwise and acted both for issuers and underwriters including Vodafone, Ajax, Equant and SNS Real.