Koen DE PUYDT graduated in 1998 with a degree in Communication Sciences (VUB), while he worked for the independent music magazine RifRaf as a journalist. After his studies, he continued his career as a music journalist with De Standaard and Studio Brussel . At the same time he obtained his Licentiate Degree in Law, specializing in Public Law at the VUB (2002). In 2009 he obtained a Master of Business Law at the University of Antwerp.
In 2002, Koen joined a Brussels niche firm specializing in Administrative Law (urban planning and environmental law, expropriations, government contracts, and protection legislation). In the meantime he remained responsible at De Puydt van Cauwelaert for the files relating to commercial law and intellectual property law.
Two years later, Koen started working full-time at the Puydt van Cauwelaert. He was responsible for matters relating to urban planning and environmental law, real estate law, government contracts, contracting law, business law, corporate law and intellectual property law. He also publishes on these matters.
In 2010 the Puydt van Chauwelaert and GD & A Advocaten merged. Koen de Puydt, as partner, headed the Real Estate / Construction Law and Corporate Law units.
Since 2002 he has been lecturer "Contracts, Assignments and Mandates" at Syntra Brussels in the vocational training for real estate agents. In the course for Real Estate Experts, Koen teaches construction law. He is the initiator of the Property Codex, a collection of legal texts tailored to the real estate professional. The codex is used throughout Flanders in the vocational training of the real estate agents within Syntra.
In August 2012, Koen co-founded the law firm ORYS. In April 2019, Koen together with Leo Peeters of Peeters Law have decided to set up a new law firm under the name of "Seeds of Law".