Anthony Berkeley
Anthony Berkeley Cox is one of the lesser remembered writers of Britain's Golden Age of Detection, yet was oddly one of the leading members of the genre at the time. While not educated in the hallowed halls of Oxford or Cambridge, like many his contemporaries, he attended the secular University College London. After serving in the British army during WWI, Berkeley took to writing as a journalist for such magazines as Punch and The Humorist. Berkeley published under many pseudonyms, such as Francis Iles, Anthony Berkeley (he omitted the Cox) and A. Monmouth Platts. In fact many people might recognize his writing as Francis Iles more, because his book, Malice Aforethought, was made into a BBC Movie staring Richard Armitage, and when I say staring, it's really a minor role, but it is staring to me.
In his writing, Berkeley is most known for the creation of the novice sleuth Roger Sheringham, who appeared in Berkeley's first novel, The Layton Court Mystery, which he published anonymously. Berkeley's book The Poisoned Chocolate Case staring Sheringham, is considered a classic of this classic genre. While he continued writing for The Daily Telegraph, The Sunday Times and The Gaurdian until his death in 1971, it wasn't his writing that Berkeley is most famous for.
In 1930 he co-founded the legendary Detection Club with Agatha Christie, Dorothy L. Sayers, Baroness Orczy, G.K. Chesteron, and other established mystery writers. The club had regular meetings where the authors would discuss their projects and get help with the technical aspects of their books. The club is noted for the fact that they adhered to a code of "fair play." Meaning, in their writing, they were to give the reader a fair chance at guessing the guilty party. While the club still exists, the fair play rule has become even more lax... in fact their were several members of the original club who didn't adhere to the rule at the time. They published several anthologies and co-authored many books, which Berkeley contributed to. Because of Berkeley's involvement in the club he is considered a key figure in the development of crime fiction and a worthy inclusion in my Golden Summer.
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Cold Steel by Kate Elliot
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Josephine Tey is one of the pseudonym's used by Scottish writer Elizabeth Mackintosh. While caring for her invalid father she took to writing. The name Josephine Tey comes from her mother's first name and her grandmother's surname. There is not much known about Tey, but that has just added to her mystique. Her most famous character is Inspector Alan Grant, whose solving of the murder of the Princes in the tower in The Daughter of Time led to a renewed interest in Richard III. In 1990 this book was chosen as the greatest mystery novel of all time. 
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Margery Allingham was born to a very literary family. Her father, mother, and aunt where editors of literary journals. Yet her parents also took to writing. Margery's father found fame as a pulp fiction writer and her mother contributed stories to women's magazines. When Margery was eight she earned her first fee as a writer for a story that ran in her aunt's magazine. As a teenager, she went to school to correct a stammer she had. While there she met her future husband, Philip Youngman Carter, whom she would collaborate with. He designed many of her book's dust jackets and even completed her final Campion novel for her after her untimely death from Breast Cancer. 
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