Jeremiah (Jerry) P. Thomas (1830 – December 15, 1885) was an American bartender; because of his pioneering work in popularizing cocktails across the United States, he is considered "the father of American mixology." In addition to writing the seminal work on cocktails, his creativity and showmanship established the image of the bartender as a creative professional. As such, he was often nicknamed "Professor" Jerry Thomas.
In 1862, Thomas finished The Bar-Tender’s Guide (alternately titled How to Mix Drinks or The Bon-Vivant’s Companion), the first drink book ever published in the United States. The book collected and codified what was then an oral tradition of recipes from the early days of cocktails, including some of his own creations; the guide laid down the principles for formulating mixed drinks of all categories. He would update it several times in his lifetime to include new drinks that he found or created. The first edition of the guide included the first written recipes of such cocktails as the Brandy Daisy, Fizz, Flip, Sour and variations of the earliest form of mixed drink, Punch. The 1876 edition included the first written recipe for the Tom Collins, which appeared just after The Great Tom Collins hoax of 1874.