Judge Kalden started her career, joining the Amsterdam Bar with the law firm Stibbe, where she practised for almost 11 years in the intellectual property department and turned to company law (focussing on mergers and acquisitions). In 2002 she became a judge at the District Court of The Hague in the Patent Chamber. In 2007 she was appointed vice president – at the District Court of Haarlem, in the Criminal Division. She returned to the Intellectual Property Division of the District Court of The Hague in 2008 till January 2009 as head of the Division, where she dealt various IP cases, but mostly patent cases. Judge Kalden was appointed to The Court of Appeal of The Hague in September 2013 where she now heads the Division that, among other areas, also covers all IP cases, including patent cases. Judge Kalden speaks at national and international conferences on Patent law and related issues. Judge Kalden acts as an arbitrator in NAI (Netherlands Arbitration Institute) arbitrations. Judge Kalden graduated at Leiden University in 1989 and finished a Master (including Intellectual and Industrial Property law at LSE) at Londen University in 1990.