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Mo Willems papers

Call Number: GEN MSS 1003

Scope and Contents

The collection consists of writings, artwork, sketchbooks, notebooks, book dummys, proofs, photographs, audiovisual material, electronic media, printed material, merchandise, a drafting table, and other papers by or relating to Mo Willems.


  • circa 1990-2013


Conditions Governing Access

This collection is open for research.

Box 10 (digital media): Restricted fragile material. Access copies of digital files may be requested. Consult Access Services for further information.

February 2017 Acquisition: In-process material. Research use may require advance notice. For further information, consult Access Services.

Immediate Source of Acquisition

Purchased from Cumberland Rare Books on the Jockey Hollow Fund, 2013, 2017.


Organized into two groupings: July 2013 Acquisition; February 2017 Acquisition.


25.63 Linear Feet ((32 boxes) + 1 art)

Language of Materials


Catalog Record

A record for this collection is available in Orbis, the Yale University Library catalog

Persistent URL

Mo Willems

Mo Willems is an American writer, illustrator, and animator.

Processing Information

Collections are processed to a variety of levels, depending on the work necessary to make them usable, their perceived research value, the availability of staff, competing priorities, and whether or not further accruals are expected. The library attempts to provide a basic level of preservation and access for all collections as they are acquired, and does more extensive processing of higher priority collections as time and resources permit.

This collection received a basic level of processing, including rehousing and minimal organization. Various acquisitions associated with the collection have not been merged and organized as a whole. Each acquisition is described separately in the contents list below, identified by a unique call number and titled according to month and year of acquisition.

Information included in the Description of Papers note and Collection Contents section is drawn from information supplied with the collection and from an initial survey of the contents. Folder titles appearing in the contents list below are often based on those provided by the creator or previous custodian. Titles have not been verified against the contents of the folders in all cases. Otherwise, folder titles are supplied by staff during initial processing.

This finding aid may be updated periodically to account for new acquisitions to the collection and/or revisions in arrangement and description.
Guide to the Mo Willems Papers
by Beinecke staff
December 2018
Description rules
Describing Archives: A Content Standard
Language of description note
Finding aid written in English.

Part of the Beinecke Rare Book and Manuscript Library Repository

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Opening Hours

Access Information

The Beinecke Library is open to all Yale University students and faculty, and visiting researchers whose work requires use of its special collections. You will need to bring appropriate photo ID the first time you register. Beinecke is a non-circulating, closed stack library. Paging is done by library staff during business hours. You can request collection material online at least two business days in advance of your visit, using the request links in Archives at Yale. For more information, please see Planning Your Research Visit and consult the Reading Room Policies prior to visiting the library.