The Jerusalem School of Synoptic Research is a consortium of Jewish and Christian scholars that study the Synoptic Gospels in light of the historic, linguistic and cultural milieu of Jesus. The beginnings of the collegial relationships that formed the Jerusalem School of Synoptic Research can be traced back to a Jewish scholar and a Christian scholar, respectively David Flusser and Robert L. Lindsey in the 1960s. For the past 50 years, ‘Christian scholars fluent in Hebrew and living in the land of Israel have collaborated with Jewish scholars to examine Jesus’ sayings from a Judaic and Hebraic perspective’.
The consortium's own website states three assumptions, shared by its members, namely, "1) the importance of Hebrew language, 2) the relevance of Jewish culture", and 3) the significance of Semitisms underneath sections of the Synoptic Gospels that in turn often yield results to the interconnection (of dependence) between the Synoptic Gospels. (These three assumptions, and not one synoptic theory, are the shared presuppositions of Jerusalem School members.)
The first two assumptions are perhaps not shared by the majority of New Testament scholars, but are neither considered to be fringe positions. Today, the common view is that Jesus and His milieu spoke Aramaic, however that Hebrew was spoken and even important is not unique to the Jerusalem School of Synoptic Research. Many more New Testament Scholars worldwide have increasingly affirmed the importance of Jewish culture for the understanding of Jesus. John P. Meier is exemplary of this significant trend when he poignantly criticizes scholarship in the twentieth century that has paid lip service to the 'Jewish Jesus' but has not really fleshed this out, stating that if we do not have a halachic Jesus, we don't have an historical Jesus.
The third assumption of the Jerusalem School basically seems to be concerned with not holding to an assumed-default position of Markan priority. It is especially the third assumption in more individually pronounced forms that has invited a response of the academic community. Some scholars have perceived the Jerusalem School as a group that holds to Lukan Priority. But this perception is incomplete since it is only Robert Lindsey and David Bivin who have argued strongly for Lukan priority. The third methodological assumption of the Jerusalem School is much broader and open, without any one theory being affirmed: