This chapter will address the question: why did trusteeship become a profession in its own right after centuries as a voluntary undertaking? The question ties into the core themes of this volume because trustees are central actors in the intergenerational transmission of wealth, and, as a result, shape patterns of inequality (Harrington, 2012a). Trustees – now more often known as wealth managers– create and oversee the structures that allow families to remain wealthy over multiple generations.