Scientists working today have a number of avenues open for the promulgation of their work. While electronic publishing of articles is now standard, new media, including podcasts and press conferences, are also used to publicize scientific research. Greco-Roman authors writing on scientific, mathematical and medical subjects also had a range of choices available to them as they selected the type of text to convey their ideas and information. Their choices included -but were not limited to -poetry, dialogue, lecture, question-and-answer text, letter, biography, recipe, epitome, encyclopedia, handbook, introduction and commentary. The consideration of the authorial choice of genre offers insights into how these writers regarded their own work, for example, in relation to the work of others. Furthermore, by choosing to write in a specific format, authors may have hoped to reach certain audiences; some texts are presumably more appropriate to students, others to specialists, still others to patrons or potential clients. And some types of texts have elements shaped by broader cultural convention rather than by the individual author. Given the range of options available to ancient writers on scientific, mathematical and medical topics, their choices of genre reflect authorial intention, including, for example, a desire to project a particular identity or image and/or to reach a special readership.