Junyao Ye, also known as Jarrett Ye is the author of the new stochastic model of spaced repetition

“It’s a substantial extension of my previous conference paper A Stochastic Shortest Path Algorithm for Optimizing Spaced Repetition Scheduling. FSRS is based on the model proposed in that paper.”

https://ieeexplore.ieee.org/abstract/document/10059206

https://www.researchgate.net/publication/369045947_Optimizing_Spaced_Repetition_Schedule_by_Capturing_the_Dynamics_of_Memory