Regarding H.W. Brands’s Aug. 3 Book World review of “The Invisible Bridge ” [“How Americans reclaimed their national pride”]:

While it is understandable that any book about the 1970s would include a reference to Werner Erhard and the est Training, what was not mentioned was that, far from simply being an iconic figure of that era, Mr. Erhard’s ideas and work continue to make an enormous difference, and his seminars spawned an entire self-development and coaching industry. Today, Mr. Erhard consults and lectures at top universities and institutions around the world.

Laurel Scheaf, San Francisco

The writer was the founding president of est.