Correspondence primarily contains letters Geck received during and immediately following his employment as an instructor and tour director for the New York School of Fine and Applied Art. Geck's primary correspondents were school administrators in Paris and New York, including Frank Alvah Parsons. Also included in this series are faculty memoranda, some by Parsons, with Geck’s notations. These records provide documentation of Parsons' pedagogical philosophies and his governance of the New York School of Fine and Applied Art.

Tour files include materials Geck used in planning his research tours for New York School of Fine and Applied Art students. Files contain class rosters, correspondence with tour guides and hoteliers, lecture notes, itineraries, expense records, teaching plans, and ephemera - such as railway schedules, maps, and brochures. Arrangement is alphabetical by location.

Primarily consists of self-published books documenting Geck's work in a number of art and design disciplines. The books include reproductions of renderings with prefatory notes explaining the context in which they were created. Renderings created during Geck’s studies and instructorship at the New York School of Fine and Applied Art will be found in the Sketches and Renderings series, while renderings executed during earlier and later periods have been donated to other archival repositories (SEE Related collections note). In addition to Geck's own renderings, this series includes four books containing reproductions of measured drawings by his students. Arrangement is alphabetical by publication title.

Includes correspondence from Parsons President Pierre Bedard soliciting Geck's editorial assistance and drafts of Geck's work on an updated edition of Frank Alvah Parsons' book of the same title. It is unclear if this revision was ever published.

Consists primarily of work Geck created during his studies at the New York School of Fine and Applied Art and renderings from his years as an instructor for the school. Life drawing sketches appear to have been completed for a class Geck took during the spring 1923 semester, possibly under the instruction of Harry Baker. Watercolor renderings include costumes, furniture, textiles, interiors, and stage designs. Some renderings indicate Geck based them on items he saw at the Metropolitan Museum of Art and Museum of Natural History in New York, while others were created at historical sites he visited with students in Europe. Seven sketchbooks, organized geographically and then chronologically by Geck, contain measured drawings of interiors in England, France, and Italy. One oversize folder contains large pen and ink renderings of identified French and Italian interiors as well as two hand-drawn maps of Italy executed while Geck was teaching at University of Colorado at Boulder. Arrangement is alphabetical.