(Matthias) Kalle Dalheimer is the President and Founder of KDAB, and also one of the founding members of the KDE project and KDE e.V. He hasn't personally been very active in KDE lately, but some of the old-timers will remember that he served as President and Treasurer of KDE e.V. for a few years. He also wrote the first C++ class ever used in kdelibs (KConfig) even though it's doubtful that any of the code is still left in today's codebase.
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