In Schreier there is a very active intermediary of contemporary music and classical modernism.
After studying music education, church music - A and conducting in Frankfurt am Main, Esslingen and Stuttgart, he became a cantor at the Stuttgart St. Mark's Church. Here he founded the Marcus Vocal Ensemble Stuttgart, with whom he performed in addition to the known repertoire of all great oratorios of the 20th century. For these years come intense pulses from the work of the International Bach Academy in Stuttgart, the SWR radio and his ensembles in choir and orchestra, and collaboration on Clytus Gottwald`s "Schola Cantorum". In 1978, Schreier then MDJ e.V. as a supporting organization of his own ensembles. In the same year Schreier took over the office of the District cantor at the Stuttgart Collegiate.
In 1980 Schreier is professor of choral conducting at the Musikhochschule Trossingen. In parallel, he is teaching at the Staatliche Hochschule für Musik Freiburg, and several times even at the Folkwang Hochschule Essen, but remained Baden-Württemberg always faithful.
In 1985 came under the umbrella of the “Musik des Jahrhundert” the Neuvokalsolisten Stuttgart. In addition Schreier founded the Young Philharmonic Orchestra, and the instrumental ensemble Varianti. Guest appearances on various radio stations, opera houses, as well as in independent productions dominated the agenda in addition to fixed activity in Stuttgart.
In addition to the premieres and first with these ensembles in the concert series of music of the centuries Schreier also occupied always very intensively with the idea of music education. Thus developed the master classes for listeners in Stuttgart as well as a ten-year extending Good Friday series, during which he brought Mahler symphonies as district cantor and vocal works in the Collegiate Church in Stuttgart for performance in the 90s.
In 2001 he retired from the direction of “Musik des Jahrhundert”, in order to devote even more so his teaching in Trossingen, but also a broader of free conducting activities.
A particular focus of Schreier's activities is now promoting the cultural potential of the Schwarzwald-Baar-Kreis through networking with the artistic resources of the Musikhochschule Trossingen and its graduates. In this context Schreier founded the Euregio T-Kultur eV, which groups the ensemble Polyphony T vocal and instrumental, together with the high school choir and orchestra of the work for the spread of high-class music from Gregorian chant to the present day in the remote places have the southern Baden-Württemberg prescribed. After the winter semester 2011/12 will take over his chair Michael Alber, the choir director of the Stuttgart State Theatre.