He was also a contributor to many periodicals of the Victorian era, most especially, Cambridge History of Modern Literature, the Dictionary of National Biography and Encyclopædia Britannica.
[1] He graduated with double honours in 1866, having taken both the Classical and Moral Science Triposes, and subsequently won the Le Bas, the Hulsean, and the Kaye Prizes.
[2][4][5] He authored a number of books while at Cambridge, many of which related to the history of the institution, including Cambridge Characteristics in the 17th Century (1867), The Ancient African Church: Its Rise, Influence, and Decline (1869), The New Reformation, A Narrative of the Old Catholic Movement from 1870 to the Present Time (1875) and The Schools of Charles the Great and the Restoration of Education in the Ninth Century (1877).
[3] This project took him well over three decades,[1] Mullinger being devoted to his academic responsibilities as well as being a regular contributor to many encyclopaedias, and journals of the period,[5] with the first volume of the History of Cambridge being published in 1873, the second in 1888 and the final one in 1911.
[5] Although he lived much of his life as "somewhat of a retired scholar", Mullinger enjoyed travelling abroad and compiled a collection of "fine photographs of buildings of architectural value".