Maya Chen
CFAChartered Financial Analyst
Twelve years on Wall Street covering mortgages, fixed income, and personal-finance analytics. Writes our finance calculators and review notes.
Dr. Aaron Pak
PhDDoctor of Kinesiology & Public Health
Former NIH researcher and ACSM fellow. Translates peer-reviewed evidence into the calculators that drive our health pages.
Jonathan Reed
MSMaster of Applied Mathematics
Built statistical models for the US Census Bureau. Now authors our math and time calculators with the same rigor.
Four-eyes review process
Every calculator page is independently reviewed by a second author from a different specialty before publication. Cross-discipline review ensures that finance calculations meet CFA standards, health calculations align with NIH clinical guidelines, and math calculations follow NIST rounding conventions. Reviewed quarterly and after any regulatory or methodological change.
Read our full editorial policy for source standards, fact-checking process, and YMYL compliance.