Research
My Ph.D. dissertation, written under the supervision of Joel Marcus at Duke University, has recently been published as a monograph entitled Contesting Conversion: Genealogy, Circumcision, and Conversion in Ancient Judaism and Christianity with Oxford University Press.
Publisher's Description of Contesting Conversion: Matthew Thiessen offers a nuanced study of the nature of Jewish thought with regard to Jewishness, circumcision, and conversion. Examining texts from the Hebrew Bible, Second Temple Judaism, and early Christianity, he gives a compelling account of the various forms of Judaism from which the early Christian movement arose.
Beginning with analysis of the Hebrew Bible, Thiessen argues that there is no evidence that circumcision was considered to be a rite of conversion to Israelite religion. In fact, circumcision, particularly the infant circumcision practiced within Israelite and early Jewish society, excluded from the covenant those not properly descended from Abraham.
In the Second Temple period, many Jews began to subscribe to a Jewishness that enabled Gentiles to become Jews. Other Jews found this definition of Jewishness problematic, and defended their own definition by reasserting a strictly genealogical conception of Jewish identity. As a result, some Gentiles who underwent conversion to Judaism in this period faced criticism because of their suspect genealogy.
This examination of the way in which Jews in the Second Temple period perceived circumcision and conversion allows a deeper understanding of early Christianity. Contesting Conversion shows that careful attention to a definition of Jewishness that was based on genealogical descent has important implications for understanding the variegated nature of early Christian mission to the Gentiles in the first century C.E.
Publisher's Description of Contesting Conversion: Matthew Thiessen offers a nuanced study of the nature of Jewish thought with regard to Jewishness, circumcision, and conversion. Examining texts from the Hebrew Bible, Second Temple Judaism, and early Christianity, he gives a compelling account of the various forms of Judaism from which the early Christian movement arose.
Beginning with analysis of the Hebrew Bible, Thiessen argues that there is no evidence that circumcision was considered to be a rite of conversion to Israelite religion. In fact, circumcision, particularly the infant circumcision practiced within Israelite and early Jewish society, excluded from the covenant those not properly descended from Abraham.
In the Second Temple period, many Jews began to subscribe to a Jewishness that enabled Gentiles to become Jews. Other Jews found this definition of Jewishness problematic, and defended their own definition by reasserting a strictly genealogical conception of Jewish identity. As a result, some Gentiles who underwent conversion to Judaism in this period faced criticism because of their suspect genealogy.
This examination of the way in which Jews in the Second Temple period perceived circumcision and conversion allows a deeper understanding of early Christianity. Contesting Conversion shows that careful attention to a definition of Jewishness that was based on genealogical descent has important implications for understanding the variegated nature of early Christian mission to the Gentiles in the first century C.E.
I am currently working on the connection between ethnicity and the rite of circumcision in the letters of the apostle Paul. Building on the conclusions of Contesting Conversion, this work will focus on Paul's letters to the churches of Galatia, the church in Rome, and the church at Philippi. This research is being funded, in part, by a generous postdoctoral research grant from the Social Sciences and Humanities Research Council of Canada, and is being conducted under the supervision of Terence L. Donaldson, Lord and Lady Coggan Professor of New Testament Studies at Wycliffe College, a member college of the Toronto School of Theology.