And for his latest (2015) book, The Thiamin Protocol, which is also free and can be downloaded as a PDF, visit THIS SITE. In this concise book, only 87 pages long, he details his findings that a daily intake of thiamin (another word for vitamin B1) and magnesium, together with a pro-thiamin diet, can reduce stuttering in about 1/3 of people who stutter. These supplements may have a calming effect, so reducing stress; or else may address a neurotransmitter deficiency. Chapter 5, The Trigger For Stuttering, details his general stuttering theory and is a tour de force.
For a fuller picture of Schwartz's thinking you may also want to read his earlier books - some copies are still available via Amazon:
Stuttering Solved - this is his first and very controversial book. In some ways outdated, but still contains many important insights.
You Can Stop Stuttering (co-written by Dr Grady Carter, a medical doctor who stutters and was helped much by the Passive Airflow approach)
Dr Schwartz's views on stuttering are hugely important for all who stutter. The speech therapy establishment has made a terrible error in opposing and marginalising him. That's one reason why stuttering therapy is, generally speaking, still in the labyrinth of seeking-and-never-finding.
Dr Schwartz is now retired and no longer presents workshops, but you can follow his free self-help online programme, consisting of three videos, a workbook and a manual. It will be found HERE. I attended some of his workshops in the 1980s and they changed my life, even though his approach is not a miracle cure and requires much practising.