Stanley Porter states that Schweitzer's critique only ended the "romanticized and overly psychologized" studies into the life of Jesus, and other research continued. Dale Allison states that other research did take place during the so-called no quest phase, and the progress was continuous in that every year except 1919 a new academic book on Jesus was published. Maurice Casey states that although it may at first appear reasonable to call this a period of "no quest" that characterization is not accurate and in this period significant other progress was made, e.g. B. H. Streeter's work on Markan priority and Q source which affected future research.