As Professor of Painting at the Royal Academy he gave a memorable series of lectures to the students of the Schools, published as Six Lectures on Painting (1904) and Aims and Ideals in Art (1906).
Clausen was an official war artist during World War I.
كان Clausen فنان حرب رسمي أثناء الحرب العالمية الاولى.
كانت Clausen فنانة حرب رسمي أثناء الحرب العالمية الاولى.