Who founded the micromuseums of the late twentieth and twenty-first centuries? And, conversely, who did not? The first part of this chapter assess the founders’ professional training, class, age, gender, and ethnicity. It transpires that the founding groups at war and conflict and transport museums were predominantly male, while the groups that founded local history groups were mixed, and often led by women. The reasons for the gender divide relate to institutional structure, finance, and to the opportunities local history museums offer to showcase women’s skills. The founding groups were also almost invariably White. The second part of the chapter asks whether structural factors contributed to the uneven authorship of museums and privileged White groups. At the most fundamental level, setting up a museum requires accommodation or a site, something to put on display, and someone to undertake the work involved. While micromuseums may often appear to be DIY enterprises, the reality is often more complex than it first appears. Arguably, there is a connection between how the museums were founded and who opened them.