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Herald focuses his practice on outsourcing, technology transactions, data protection, strategic relationships and M&A. He has led many complex multi-jurisdictional matters, in the technology and financial industries. His forte is deal making and he goes where the deal is, which brought him to New York, Silicon Valley, London, Paris, Brussels, Stockholm, Berlin, Frankfurt and other places. He is known for his efficient pressure cooker negotiations. Before joining Greenberg Traurig, Herald was a partner for 20 years in the Corporate team of Allen & Overy.

Herald is consistently ranked in Tier 1 by Chambers and Legal 500.


  • Asset management
  • Banking
  • Data protection
  • Global transactions
  • Government
  • Insurance
  • Mergers & acquisitions
  • Outsourcing
  • Technology


Recognition & Leadership

  • Listed, IFLR1000, "Highly Regarded," M&A
  • Listed, Acritas Stars™ Independently Rated Lawyers, “Star Lawyers”
  • Chambers Europe, TMT: IT & IT Outsourcing - Netherlands, Band 1
  • Legal 500, The Netherlands, Commercial, Corporate and M&A (Recognized Individual); Industry Focus: Information Technology (Leading Individual)
  • “A client enthuses that Herald Jongen is ‘excellent and a one-of-a-kind negotiator’." (Chambers Europe, 2022)
  • “The ‘incredibly experienced’ Herald Jongen (…) is ‘able to quickly analyse complex issues’ and appreciates that he is ‘result-oriented in a pleasant and constructive manner’.” (Chambers Europe, 2021)
  • Herald Jongen 'is an exceptionally effective negotiator and has an excellent command of the practical issues involved with IT outsourcing' (Legal 500, 2019)
  • “He has a great command of the underlying business issues involved in outsourcing" (Chambers Europe,  2019)
  • "Extremely pragmatic, with a clear business sense. He has a drive to get the deal done and agree a contract that is workable from a business point of view." (Chambers Europe, 2017)
  • "The sheer depth of his market knowledge leaves a lasting impression on clients, who speak of his openness, accessibility and creativity."
  • "Market sources see him as a major deal maker who knows where to focus his attention". They also highlight his up-to-the minute industry expertise, which means he is ‘always in the loop with whatever’s going on’." (Chambers)
  • “Herald Jongen guides the group with ‘supreme expertise in the field’. Clients are ‘deeply impressed with his ability to understand the complex issues and translate them into simple concepts - an enviable strength’.” (Chambers)
  • “Herald Jongen enjoys a reputation as one of the best lawyers in the market for IT outsourcing and transactions, and is a logical first choice for clients, who value his business-minded and assured approach.” (Legal 500)
  • "Clients appreciate his no-nonsense and practical mentality, whilst peers admire him for his skill in complex outsourcing transactions."
  • "A pleasure to work with."
  • “a logical first choice” for clients


  • LL.M., VU Amsterdam, 1985
  • The Netherlands
  • Dutch, Native
  • English, Fluent
  • German, Fluent
  • French, Conversational