Go back 09. gennaio 2020 Berlin Change of control at Kieback&Peter Pressemitteilung | M&A | Management Christoph Ritzkat is the new majority shareholder of the smart building pioneer. © Kieback&Peter With effect from December 1, 2019, Christoph Ritzkat, Chairman of the Board of Kieback&Peter, is the new majority shareholder of the traditional Berlin company.