Authors: Trevor Bowen (UC Berkeley), Tamar Ervin (UC Berkeley), Alfred Mallet (UC Berkeley), Nikos Sioulas (UC Berkeley), Ben Chandran (UNH), Kris Klein (UAZ), Jono Squire (U Otago), Phil Isenberg (UNH)

Understanding the nature and importance of various proposed heating processes that result from turbulent dissipation is imperative in describing a range of collisionless systems. We highlight the importance of kinetic phase space signatures of heating as pivotal in providing necessary constraints on turbulent dissipation. Understanding mechanisms through diffusive approximation schemes is largely a tractable problem that can be studied with modern plasma instrumentation. We highlight recent progress in understanding signatures of kinetic dissipation and particle heating using the Parker Solar Probe (PSP) mission. Importantly, our observations reveal that a range of heating mechanisms (stochastic heating, cyclotron resonance, and Landau damping) are likely important in explaining observed phase-space plasma signatures. We discuss the signatures of these processes in both the super Alfvénic and sub-Alfvénic wind and present future courses of study for the extended PSP mission. The use of non-parametric approximations to particle distribution functions (via Hermite polynomials, Radial Basis Functions, Machine Learning Methods) is pivotal in understanding and characterizing these heating mechanisms.