I'm curious as to why it is so important to you?
Yes, many magicians through the years were part of the Masons, including Harry Kellar and Howard Thurston... I believe Blackstone, Sr and Dante were also members. But Doug Henning wasn't nor dozens of other successful performers/designers that are out there.
But yes, the era has a lot to do with it. People from the late 1800's and early 1900s were part of a cultural revolution in which things esoteric, pseudo-intellectual and of course "secret societies" were all the rage; just about everyone belonged to some facet of Free Masonry/Templar ideology or something akin to the Rosicrucians. There were even revivals (supposedly) of various Egyptian and Greek cults, the Theosophical Society and far more other movements, more than I can count. All basically there because of social & cultural influences of the day, much of which can be seen in the architecture of the times; the Egyptian (primarily) motifs found in Art Deco and Grecian elements seen in Art Nouveau.
During the 20's and into the early 40s we found another wave of anti-Masonry put out through religious fanaticism, which drove the fellowship a bit more underground for a very short period. As stated, Free Masonry and similar groups came back into vogue following the war and the need to rebuild as well as expand various aspects of society in which the Western European idea was prevalent (just look around at what nations saw a boom in way of growth between 1948 and roughly 1968); just as the Masonic groups gave impetus to the Industrial age so we see their hand at the start of the Nuclear Age.
As early as 1972-73 a new religious zealot movement began with more "warnings" against Free Masonry, but the more escalated actions didn't come into vogue until the mid-1980s to "present". Unlike previous fear mongering by christian zealots however, the new expressions of paranoia resulted in a boost to Masonic memberships and growth in secret society culture. The size of such groups in today's world is substantial, placing the Masons back on the forefront (quietly) of the Information Age and it's growth.
In all the years I've studied this particular area (along with Grail lore, sacred blood lines, etc.) I've never found a single reason to view them as evil, sinister or in league with any kind of demonic force (quite the contrary). In most every instance I've seen the masons supportive of society, humanity and the general welfare thereof, only to have the church slap them in the face with a myriad of slanders and false witnessing of the likes to make one's head spin (seems they hate competition).
So I must say again, "Why is such association so important for you to know?"