| Abstract: | High-frequency-peaked BL Lac blazars (HBLs) dominate the extragalactic sky at energies above 0.1 TeV, but many questions still remain about source class properties and particle acceleration mechanisms in their jets. HBLs are often observed during flares, biasing our understanding of their properties and duty cycles. The VERITAS observatory has conducted an observing campaign of 36 X-ray-selected blazars to produce the first unbiased TeV survey of HBLs, which is a crucial step towards deriving a TeV luminosity function and modeling the HBL population across cosmic time. In this talk we will present the full results of the VERITAS survey, including the first logN-logS distribution of TeV fluxes from HBLs. We will also discuss results of a joint observing campaign of one of these sources, Mrk 421, combining gamma-ray observations from VERITAS with simultaneous X-ray polarization measurements from IXPE. The combined results provide information about the physical properties of the emission region where both the X-rays and gamma rays are produced, and help constrain the possible particle acceleration mechanisms in the blazar jet. |