A few days ago the New York Times published an op-ed by a person identified only as a “senior official in the Trump administration.” This person claims to be part of a group of senior officials who are “working diligently from within to frustrate parts of [President Trump’s] agenda”. The Washington Post and others have attempted to uncover the anonomous writer, but suggestions remain speculative. Was it Mike Pence? Nikki Haley? Mike Pompeo? Nobody knows, so we at Bookmatch decided to give it try.

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Bookmatch normally analyzes the text of a fiction novel and compares it against bestsellers. With a bit of tweaking we were able to setup a way to compare the anonymous article against op-eds written by members of the White House Cabinet. Bookmatch can then use a machine learning method that implements stylometry to attempt to match the article with one of the authors. Stylometry is a way to “fingerprint” an author’s writing style by tracking the frequency of common words, parts of speech, and punctuation.

We were only able gather 68 articles written by 8 cabinet members. To qualify for our analysis each person had to have written at least 5 articles. Any less and the accuracy of the algorithm would be severely affected. Bookmatch is optimized for ~100,000 word novels, so <1,000 word articles stretch the capabilities of stylometry. The results are interesting nonetheless.

Our Candidates

The top 8 most prolific writers in the White House cabinet staff are:

  • Alex Azar, United States Secretary of Health and Human Services
  • Linda McMahon, Administrator of the Small Business Administration
  • Mick Mulvaney, Office of Management and Budget
  • Mike Pence, Vice President of the United States
  • Mike Pompeo, United States Secretary of State
  • Nikki Haley, United States Ambassador to the United Nations
  • Robert Lighthizer, United States Trade Representative
  • Sonny Perdue, United States Secretary of Agriculture

We will assume the anonymous writer is one of these eight people for our analysis.


Before we start the analysis a few things have to happen. First, each article has to be cleaned of non-standard characters. Bookmatch then chunks the articles into 500 word sizes. This helps to standardize the data and increase the data points that we can harvest. Next, Bookmatch identifies the parts of speech of each word and generates a list of data points we can look at.

Parts of Speech Analysis

Parts of speech frequency is the best to visualize. The staff member with the most similar fingerprint to the anonymous op-ed is Alex Azar. The least similar is Linda McMahon. Here are the bar graphs, the vertical line on the authors’ bars displays the standard deviation (68% of the tracked values fall between the line):

Alex Azar vs Anonymous

Alex Azar

Linda McMahon vs Anonymous

Linda McMahon

Full Analysis

On top of looking at the frequency of parts of speech, we can also track 50 of the most commonly used words. Hyphens and question marks are also used frequently by certain authors. We then use a machine learning algorithm called a gaussian process classifier to predict who wrote the letter.


Our algorithm successfully predicts an author of an article with 50% accuracy, 4x better than randomly guessing. 86% of the time the author is in one of the top three choices.

Most Likely

  • Alex Azar (27% likely)
  • Mick Mulvaney (26% likely)
  • Robert Lighthizer (13% likely)

Least Likely

  • Mike Pence (2% likely)
  • Nikki Haley (4% likely)
  • Linda McMahon (8% likely)

Of the top three, Robert Lighthizer seems to write the most about topics mentioned in the anonymous op-ed. He wrote highly about Senator McCain and warns about Republicans’ changing views on free trade. However, we did not want to include words that covered these topics to remain as unbiased as possible considering how little data there is.

What we can say with strong certainty, is that Mike Pence did not write the op-ed. He is one of the primary subjects according to many news platforms because of his past use of the word “lodestar”. However, his writing style is very different. For example, the hyphen pattern <phrase> - <phrase> - <phrase> is used twice in the op-ed. Mike Pence never uses this pattern in our comparison articles.

I hope you enjoyed reading this blog post! We hopefully got closer to the truth, and this was a fun exercise to test Bookmatch in the real world. If you have any questions or comments feel free to email me at [email protected] or tweet @_bookmatch.


After further investigation, we found evidence that none of our candidates are the anonymous writer. Plotting the probability distribution of the algorithm’s top choices shows that our algorithm is signifigantly less confident about the anonymous author’s identity than would be expected. The hunt continues, but at least we were able to eliminate some of the options.

Probability Distribution