The ISM and dust properties of (post-)reionization galaxies probed by ALMA and JWST

For obtaining a complete picture of galaxies, multi-wavelength observations are crucial to observe their stars, gas, dust, and chemical composition. With Hubble, JWST, and ALMA operating at the same time, we find ourselves in an era where we can jointly observe the UV, optical and infrared light of high redshift galaxies to describe their ISM properties in detail. I will present first results from two new programs, which take advantage of imaging and spectroscopy from HST, JWST, and ALMA. The main goal of the ALPINE-CRISTAL JWST program is to combine high-resolution sub-mm observations with JWST/IFU spectroscopy to study the chemical compositions and dynamic properties of the ISM of z=4-6 galaxies as well as possible contributions and feedback from AGN. CHAMPS is a 1.2mm ALMA large program synergistic to JWST NIRCam and MIRI imaging to search for the most dust-obscured sources during the Epoch of Reionization.