He transformed the fortunes of the publishing house Cassell & Company, and later became its proprietor. As an author, he published studies of the composers George Frideric Handel, Franz Schubert and (as co-author) Arthur Sullivan. He also edited the million-word journals of Arnold Bennett for publication.
After schooling at the Whitgift School he entered the publishing trade in London at the age of 17.
K. G. Personal life Flower was twice married, first in 1903 to Evelyne Readwin of Wells, Norfolk, with whom he had one son, and second in 1943 to Bridget Downes of Coore, County Clare, Ireland. He died at his home, Tarrant Keynston House, near Blandford, Dorset, aged 84.