Werner von Siemens
Werner von Siemens retired in 1890, while Johann Georg Halske had already left the company in 1867. Werner von Siemens' brother Karl Heinrich, together with Werner's sons Arnold and Georg Wilhelm, grew the firm and erected new Siemens &amp; Halske premises along the banks of the western Spree river, in the Berlin suburb of Charlottenburg, in 1897. The firm's vast new site continued to grow, and from 1899 onwards it was known as Siemensstadt.