He taught English from 1977 to 1979 at Gomarus College in Groningen, and Old and Middle English and historical linguistics at Radboud University from 1979 to 1986. Since 1986 he has been with Leiden University. In 1994 Bremmer was the Erasmus professor at Harvard for Dutch Culture and History. He is a premier Dutch authority on Frisian language and literature, occupying a special professorship in Frisian studies.[4][5]
Bremmer has published and edited books on a variety of topics in Old English language and literature, Middle English language and literature, and Frisian language and literature.[6][7] He has published on the seventeenth-century scholar and collector Franciscus Junius, he has translated the work on Beowulf by Dutch Anglo-Saxon scholar P. J. Cosijn,[8][9] and has lectured on J.R.R. Tolkien.[10] His Introduction to Old Frisian (2009) (a book for the beginning student[11]), according to E.G. Stanley, is "a book for the twenty-first century...a book of essentials, from which nothing essential has
been omitted."[12] In 2009 he published a kind of alphabet book with 26 terms from the Christian lexicon, Van Ambt tot Zonde ("From office to sin"),[13] illustrated by Geert de Groot, which explains the Christian connotations of such concepts as sin and foreskin;[14] the booklet collects articles originally published in the national daily Nederlands Dagblad.[15]
An Introduction to Old Frisian: History, Grammar, Reader, Glossary. Amsterdam/Philadelphia: John Benjamins, 2009.[19]
Van Ambt tot Zonde: Een greep uit onze christelijke woordenschat. Heerenveen: Protestantse Pers, 2009.
Manuscripts in the Low Countries. Anglo-Saxon Manuscripts in Microfiche Facsimile 13 (with Kees Dekker). Tempe: Arizona Center for Medieval and Renaissance Studies, 2006
'Hir is eskriven'. Lezen en schrijven in de Friese landen rond 1330. Hilversum: Verloren / Ljouwert: Fryske Akademy, 2004.[6][7]
A Bibliographical Guide to old Frisian Studies. Odense: Odense UP, 1992.
The Fyve Wyttes. A Late Middle English Devotional Treatise, Edited from BL MS Harley 2398 with an Introduction, Commentary and Glossary. Amsterdam and Atlanta: Rodopi, 1987.
Books edited
Practice in Learning. The Transfer of Encyclopaedic Knowledge in the Early Middle Ages (with Kees Dekker). Paris, Leuven, and Dudley: Peeters, 2010.
Advances in Old Frisian Philology (with Stephen Laker and Oebele Vries). Amsterdam and New York: Rodopi, 2007.
Signs on the Edge. Space, Text and Margin in Medieval Manuscripts (with Sarah Larratt Keefer). Paris, Leuven, and Dudley: Peeters, 2007.
Foundations of Learning. The Transfer of Encyclopaedic Knowledge in the Early Middle Ages (with Kees Dekker). Paris, Leuven, and Dudley: Peeters, 2007.
Rome and the North: The Early Reception of Gregory the Great in Germanic Europe (with Kees Dekker and David F. Johnson). Paris, Leuven, and Sterling: Peeters, 2001.[20]
In skiednis fan de Fryske taalkunde (with Anne Dykstra). Ljouwert: Fryske Akademy, 1999.
Franciscus Junius F.F. and His Circle. Amsterdam and Atlanta: Rodopi, 1998.[21]
Companion to Old English Poetry (with Henk Aertsen). Amsterdam: VU Press, 1994.[22][23]
Approaches to Old Frisian Philology (with Thomas S. B. Johnston and Oebele Vries). Amsterdam and Atlanta: Rodopi, 1998.
Notes on Beowulf (trans. of P.J. Cosijn, Aantekeningen op den Beowulf, with Jan van den Berg and David F. Johnson). Leeds: School of English, University of Leeds, 1991.[8][9]
Aspects of Old Frisian Philology (with Geart van der Meer and Oebele Vries), Amsterdam and Atlanta: Rodopi, 1990.
^Liberman, Anatoly (1997). "Rev. of Henk Aertsen, Rolf Bremmer, Companion to Old English poetry". English Studies. 78 (2): 190–93. doi:10.1080/00138389708599071.
^Mora, María José (1995). "Rev. of Henk Aertsen, Rolf Bremmer, Companion to Old English poetry". Atlantis: Journal of the Spanish Association for Anglo-American Studies. 17 (1/2): 337–44.