Charles Gesner van der Voort (1916-1991) worked at Holland-China Trading Company (HCHC), with offices in Hong Kong, Shanghai, Tientsin (Tianjin), Rotterdam and London. At the start of the company, in 1903, Willem Kien (1877-1970) started to work for HCHC in Shanghai, later becoming director. In 1921 he left China and became director at the Rotterdam head office, at Diergaardelaan 36.
Willem Kien obtained this photo during a visit in Hong Kong in the 1930s. I believe a tram line is visible on the left (Peak Tram?).