Sir Donald Daniel Mann, who was also referred to as "Dan" or "D.D." before his knighthood, was a Canadian railway contractor and entrepreneur.

Acton is a community located in the town of Halton Hills, in Halton Region, Ontario, Canada. At the northern end of the Region, it is on the outer edge of the Greater Toronto Area and is one of two of the primary population centres of the Town; the other is Georgetown. From 1842 until 1986, the town was a major centre for the tanning and leather goods industry. In the early years, it was often referred to as "Leathertown".