One of Eduard's elder brothers was Ernst Ezechiel Pfeiffer, who would be remembered for his support of a number of charitable foundations in Cannstatt (fr). Eduard Pfeiffer inherited considerable wealth and economic expertise, and used them to build an impressive entrepreneurial career of his own. In 1869 he was one of the founders of the "Württembergischen Vereinsbank" (roughly "Württemberg Associated Bank""), and was largely responsible for its growth during the generally economically benevolent decades of the German empire period. He was a member of the oversight boards of various leading businesses in the region and an influential member