Ernst Heinrich Roth had two sons: Gustav Albert and Ernst Heinrich II. Albert Roth learnt the luthier trade from his father. Ernst Heinrich Roth II, on the other hand, received a training in commerce and in 1921 settled in the United States, where he founded a trading company, "Scherl & Roth". It is through this company that many Roth instruments, bows and other merchandise came onto the North American market, where quite a number of them, from different periods and of very uneven quality, can be found to this day. As a matter of fact, quality Roth instruments from the most sought-after period (see below) are, to this day, harder to find in Germany than in the United States. This goes some way towards explaining the fact that, generally speaking, Roth instruments are better known in the US than in their original country of provenance.