Writer · Statistician
Michael O'Brien ✓ Verified expert
Michael O'Brien is a SAS-certified biostatistician and the owner of Math World Consulting in Kendall Park, New Jersey. He has worked on pharmaceutical research projects, taught statistics at Mercer County Community College and has tutored math and statistics for more than 30 years. He holds an M.S. in statistics from Rutgers University.
2Written
0Reviewed
Sep 2026Joined
Experience
- OwnerMath World Consulting LLC2020 to present
- Biostatistician, Pharmaceutical ResearchMath World Consulting LLC2009 to 2024
- Math and Statistics TutorPrivate practice1991 to 2024
Education
- MS, Statistics (biostatistics track)Rutgers University2009
- BA, MathematicsRutgers University1991
How Michael works on our pages
Michael works as a biostatistician, where other people rely on the numbers he produces.
As a writer
- Explains what each result means in plain words.
- Points out when an outlier can pull the mean away from the typical value.
- Has every draft reviewed before it goes live.
As a reviewer
- Recomputes each result independently.
- Checks that mean, median and mode are used where each one fits.
- Confirms that rounding stays consistent across the page.
What happens before Michael signs off on a page
- Formula checkDefinitions and formulas are checked against standard statistics references.
- Number checkEvery worked example is recalculated by hand and in a spreadsheet.
- Edge casesCalculators are tested with blank rows, zeros, negative values and decimals.
- Sign-offMichael's name and the review date are added to the page.
