Sabine Hossenfelder is a German theoretical physicist who specializes in the foundations of quantum mechanics, the phenomenology of quantum gravity, and modifications to general relativity. She has been an outspoken critic of certain developments in contemporary theoretical physics, arguing that the field may be hindered by aesthetic biases and a lack of empirical validation. Her book "Lost in Math: How Beauty Leads Physics Astray" delves into these concerns, discussing how the pursuit of mathematical beauty might be leading theoretical physics away from empirical evidence.

In addition to her scientific work, Hossenfelder maintains the popular blog "Backreaction" and a YouTube channel, where she discusses topics in physics and critiques some of the prevailing trends in the field.