Wolf Rayets: interferometry of hot dust Wolf Rayets (WRs) are hot massive stars at a late stage 
of evolution. They are prominent signposts for high mass star formation and their massive winds 
have significant influence on the interstellar medium. A small but significant number of these 
stars in the Galaxy are known to produce copious amounts of dust. Given the hostile circumstellar 
environment, this raises interesting questions. Interferometric and aperture masking observations 
strongly indicate that binarity plays a pivotal role in the dust formation. I will briefly 
review high angular resolution observations in the near- and mid-infrared which shed some light on 
dusty WRs.