Mark B. Schlemmer (he/him)

Mark has 16+ years of experience in the museum sector, augmented with an MA in Museum Professions (Registration and Collections Management) from Seton Hall University. He is passionate about the role of museums in our society, and believes firmly that #MuseumsAreNotNeutral.

Since 2015, he has been on staff at The New York Historical (PKA The New-York Historical Society.) In 2018 he was promoted to Registrar for Collections, the position he currently holds. Mark manages the museum's active outgoing loans program, organizes the registrarial logistics for select travelling exhibitions, and collaborates on collections-based in-house temporary exhibitions. Prior to that, he was on the registrarial team at the Solomon R. Guggenheim Museum.

From 2014 to 2017 Mark proudly served on the Board of Directors of ARCS (Association of Registrars and Collections Specialists) where he was also the Chairman of the Education Committee. In that role, he founded and managed the first fifteen editions of #ARCSchat, a monthly Twitter-based conversation on topics related to museums and collections management.

In 2013, Mark founded @ITweetMuseums, a popular, non-affiliated, independent Twitter-based initiative. Over the following years, the account attracted 15000+ followers. Much more than just a Twitter account, the multifaceted project was created to encourage and support all cultural workers to tweet about museums from their personal accounts. For a look into museums from the point-of-view of the dedicated staff who work in them, seek out the hashtag #ITweetMuseums on Twitter (now ‘X’), Instagram (where 15000+ photos have now been tagged), and other social media platforms. Or, check out these Wakelet posts of summaries from his past in-person events (Tweet-ups, etc.), moderated educational chats, university lectures, conference presentations (in English and Spanish), and various how-to resources he created. After ten active years, the project, having met its objectives, was sunset in 2023.

Mark is also keenly interested in foreign languages. In addition to a BFA degree in Design, he has a BA in French, is proficient in Castilian Spanish, and is compelled to eventually learn more Italian than what he can currently fake his way through. He studied and worked in France and Spain for twelve years, and always looks forward to any opportunity to travel abroad for either work or pleasure.