Celebratio Mathematica is a new open-access scholarly web publication that celebrates mathematics and related fields, and their people. Celebratio Mathematica is structured as a series of collected-works volumes or, rather, enhanced guides to the collected works of selected scientists, with the added advantages of electronic media. Celebratio Mathematica organizes, displays and preserves biographic and bibliographic information, indexing all documents deemed worthy of inclusion in a collected-works volume. These can include unpublished documents, letters, interviews, and more—possibly even hosting those works for which republishing rights can be secured. Celebratio Mathematica will also include commentaries on the scientists’ work, photographs, testimonials, varied memorabilia, and information on his or her graduate students. Celebratio Mathematica’s independent editorial board chooses the scientists based on scientific merit, scholarly interest, and editorial opportunity. Celebratio Mathematica is supported by MSP and public generosity.