His books are product of careful research, using methods and knowledge from exact sciences. That provides him a unique insight into the Mueller investigation and the whole Spygate. Leo Goldstein has a M.Sc. in Mathematics, 20+ years of experience in computer software and networks, and cyber security. He is also a successful start-up founder.
He is not intentionally partisan or even political, with a caveat. The worst case of ignorance is when a person is ignorant about a subject but imagines him- or herself knowledgeable about it. Even worse is when like-minded ignoramuses get together in large groups. They validate each other, which reinforces their ignorance. When such a group becomes powerful enough to suppress dissenting opinions, it becomes extremely dangerous. Yes, this applies to the Democratic party, and has been its key characteristic for more than a decade.
Diversity is not always bad. Leo was born in the former Soviet Union (and is shocked by the similarity between the ideas of the mainstream left to the ideas of the Communist Party of the Soviet Union), speaks Russian, and knows a thing or two about "Russian hackers". He spent most of his career in California but now lives in Texas.
The evidence of the "New York Times libeled" credentials of the author are available on the NYT website. The author was a target of a NYT journalistic hatchet job on December 29, 2017. The NYT article highlighted that the author published his opposition to climate alarmism using Google Ads. Within two weeks of the publication, Google disabled the author’s ads account under a totally bogus pretext and warned against attempts to “circumvent” the Google ban.