I am a cosmologist and astrophysicist, in the Department of Physics at Imperial College London, where I am also the Director of the Imperial Centre for Inference and Cosmology. I am especially interested in the interpretation and analysis of cosmological data using principled Bayesian statistical techniques.

I also occasionally express my opinions on music, politics, parenthood, or technology.

• Twitter/X: @defjaf
• Mastodon: @jaffe@mastodon.social
• Bluesky: @defjaf.bsky.social

• Blog: Leaves on the Line
• Microblog