Abstract: > n the CDM structure formation scenario galaxies traces the large scale structure in a biased way. On large scales, the bias is determined by the mass of the galaxies. Recent advances in large area surveys have made it possible for very accurate statistical studies of galaxies in the context of structure formation. Such studies have revealed some interesting correlations between galaxy properties and their large scale bias. Active galactic nuclei (AGNs) play an important role in galaxy formation. Correlations between AGN properties and their bias provides an interesting perspective on the host galaxy of AGNs and their dark matter halos. Observationally, AGNs selected in different electromagnetic wave bands selects particular features of AGNs in those bands. Hard X-ray emission from AGNs originates from the inner accretion disk. The radiation is close to isotropic and is not strongly affected by absorption. Comparing to selection methods optical or IR, hard X-ray yields the least biased sample of accreting supermassive blackholes. In this talk, I discuss some recent progress in the study of AGN clustering using hard X-ray observations. I also present some new results using data from Chandra surveys (CLASXS, CLANS, CDFN, CDFS), and the SWIFT/BAT survey. The combination of low and high redshift AGN sample allow us to constrain on the evolutionary stage of AGN host galaxies.