Heinrich founded, owns and manages the publishing company MatrixMedia Verlag in
Göttingen. The company publishes history books, mostly on the local history of the state of
Lower Saxony, of which the predecessor states were the
Kingdom of Hanover and the
Duchy of Brunswick, and the history of the
House of Welf. The company publishes books, monographs, historiographies, memoirs, illustrated books and films. He also operates a website on the House of Welf called
Welfen.de. == Personal life ==