My favorite non-mathy posts, in chronological order:

• My Cause Selection 2015 in which I decide where to donate my money in 2015.
• GiveWell’s Charity Recommendations Require Taking a Controversial Stance on Population Ethics in which I argue exactly what the title says.
• All Expected Utility Distributions Have One of Two Big Problems about how it is impossible, even in theory, to have a sensible prior distribution over the expected utility of actions.
• The Risk of Concentrating Wealth in a Single Asset about how individual stocks are 2–4x as risky as the market, and if you hold most of your wealth in a single asset, you can get huge gains by diversifying.
• A Comparison of Donor-Advised Fund Providers in which I review all the major donor-advised fund providers and offer my recommendations.
• Obvious Investing Facts in which I list some obvious but underappreciated investing facts.

My favorite mathy posts:

• A Complete Quantitative Model for Cause Selection in which I build a complicated Bayesian quantitative model for comparing causes.
• Estimating the Philanthropic Discount Rate on the reasons why a philanthropist might discount the future, and how much those reasons matter.
• Asset Allocation and Leverage for Altruists with Constraints on how philanthropists can improve their investment portfolios by (1) adding leverage and (2) decreasing correlation with other philanthropists’ investments.
• Investors Can Simulate Leverage via Concentrated Stock Selection in which I show that concentrated factor portfolios (mostly) behave like leveraged, less-concentrated portfolios.
• Should Earners-to-Give Work at Startups Instead of Big Companies? about how earners-to-give can think about the risk and return of working at a startup.