Siepmann manufactures for the railway, wind power, heavy duty, valve, marine, construction equipment, production and mining industries.

It currently has the following divisions: The conglomerate Siepmann had a predecessor company founded by the German industrialist Wilhelm Bergenthal (1805–1893) and his brother-in-law Ferdinand Gabriel in 1834 which was growing rapidly at the time.

Bergenthal was an inventor and pioneer who brought production principles from Brandenburg to the Warstein area and established a manufacturing company for shovels made out of sheet steel.

However, Louis Peters, did hand the daily business to his brothers-in-law Emil (1863–1950) and Hugo Siepmann the first one handling the technical development and the lather the commercial and sales departments.

The post-war period with galloping inflation up to the introduction of the Rentenmark in November 1923 also caused great difficulties for domestic industry, which only led to a gradual improvement from 1925 onwards.

Large quantities of these welded pieces were manufactured for the Deutsche Reichsbahn and for the victorious powers of the time as reparations.

By securing the energy supply and important technical innovations, the Siepmann works became one of the most modern drop forges in Europe.

In 1938, the Siepmann's built the first production line for forgings in Germany, consisting of three counterblow hammers, three presses and the associated furnaces.

[12] Siepmann grew rapidly during World War II and became the largest manufacturing company of the region with steady and fast growth.

Forced rationing reduced the population's quality of life considerably, even if there was no depressing lack of food due to the still rural structure.

But the last years of the war, with low-flying aircraft and artillery fire, made it clear to everyone where the demagogue Hitler and his followers had led the people.

The importance of Siepmann for armaments is shown by the laying of a gas pipeline from Freieohl via Warstein to Belecke in 1941, i.e. during World War II.

In addition to German specialists, French, Russian and, from 1943, also Italian prisoners of war were employed, as well as men and women from the occupied countries who had been conscripted by the Nazis, especially from the USSR.

He gained substantial wealth through his industrial patents, which were used worldwide, only a minority of the company remained in the hands of the heirs of Emil Siepmann.

Schwittay is also a member and vice president of the general assembly of IHK Arnsberg (Chamber of Commerce and Industry).