It's not accurate to say that anyone specifically said electrons are found in electron clouds, not paths. The idea that electrons occupy regions of space called electron clouds rather than specific orbits is a consequence of the development of quantum mechanics.

Here's a breakdown:

* Early Atomic Models: Early models, like the Bohr model, depicted electrons orbiting the nucleus in well-defined paths. These models were useful but couldn't explain certain observations.

* Quantum Mechanics: Quantum mechanics revolutionized our understanding of the atom. It showed that electrons don't follow fixed paths. Instead, their position and momentum are described by probabilities, meaning we can only know the likelihood of finding an electron in a particular region of space.

* Electron Clouds: These probabilistic regions of space where electrons are most likely to be found are called electron clouds.

So, it wasn't a specific person who said electrons are in clouds, but rather a shift in scientific understanding brought about by quantum mechanics.