Otto Kyllmann was a publisher, who held a senior directorship of Constable & Co

Constable & Robinson

Constable & Robinson Ltd. is an independent British book publisher of fiction and non-fiction works. Founded in Edinburgh in 1795 by Archibald Constable as Constable & Co. it is probably the oldest independent publisher in the English-speaking world still operating under the name of its...

 from 1909 until 1950.

Kyllmann's first wife was Victoria Mary Louise Adelaide Cunliffe-Owen, the sister of Mary Wills (DBE)

Mary Wills (DBE)

Dame Mary Monica Cunliffe, Mrs. Wills, DBE, D.GSt.J was a Dame Commander of the Order of the British Empire and Dame of Grace, Order of St John of Jerusalem. She received these honours for her philanthropy.-Early years:...

, but they were divorced and she remarried in 1919. His second marriage also ended in divorce.

Kyllman subsequently had a very close relationship with the scholar Helen Waddell

Helen Waddell

Helen Jane Waddell was an Irish poet, translator and playwright.-Biography:She was born in Tokyo, the tenth and youngest child of Hugh Waddell, a Presbyterian minister and missionary who was lecturing in the Imperial University. She spent the first eleven years of her life in Japan before her...

, several of whose books were published by Constable. Knowing Waddell to be short of money, he offered her permanent employment at Constable Other protégés of Kyllman included George Bernard Shaw

George Bernard Shaw

George Bernard Shaw was an Irish playwright and a co-founder of the London School of Economics. Although his first profitable writing was music and literary criticism, in which capacity he wrote many highly articulate pieces of journalism, his main talent was for drama, and he wrote more than 60...

, Mary Johnston

Mary Johnston

Mary Johnston was an American novelist and women's rights advocate.The daughter of an American Civil War soldier who became a successful lawyer, Mary Johnston was born in the small town of Buchanan, Virginia. A small and frail girl, she was educated at home by family and tutors...

, May Sinclair

May Sinclair

May Sinclair was the pseudonym of Mary Amelia St. Clair , a popular British writer who wrote about two dozen novels, short stories and poetry. She was an active suffragist, and member of the Woman Writers' Suffrage League...

 and Marie Corelli

Marie Corelli

Marie Corelli was a British novelist. She enjoyed a period of great literary success from the publication of her first novel in 1886 until World War I. Corelli's novels sold more copies than the combined sales of popular contemporaries, including Arthur Conan Doyle, H. G...

. A collection of Kyllmann's correspondence, dated between 1900 and 1957, is held by Queen's University, Belfast., having been donated by Helen Waddell's niece after Waddell's death.