Arthur Aikin Brodribb,
Dictionary of National Biography…
(1912)
“ From 1861 onwards Cooper was a working journalist, his first engagement being that of a sub-editor of the 'Daily Telegraph.' In 1862 he became a parliamentary reporter of that paper. He had learned shorthand, the Mason-Gurney system, and, besides putting it to practical purposes, published a manual of the system, 'Parliamentary Shorthand,' as early as 1858. Later, he became a recognised authority on the history of the art. ”
