William Atheling, Jr.

The penname James Blish used to write the important early criticism of SF which was later collected by Advent in The Issue at Hand, and More Issues at Hand.

from Fancyclopedia 2 ca. 1959
Jim Blish, a fan-turned-pro who contributed a long series of percipient criticism under this byline to Redd Boggs' SKYHOOK in the mid-50s. The pename's from that of Ezra Pound, who wrote criticism as William Atheling. Junior's identity was a great puzzle at the time he was writing; those who pondered it might have reached the solution if they'd known who senior was, since Blish is a great admirer of Pound's poetry and criticism.