Deputy chairman Professor Brian Tanner will take over the role until the board elects a new chairman.
Tanner said: "Richard has been an important source of influence and has helped us since he first joined us in 2005 and more importantly as our Chairman since 2008, taking us through the IPO process and beyond. We wish him well in the future."
At 9:11am: [LON:KMK] Kromek Group PLC share price was -1p at 35p
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