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In this thesis, I present an investigation into the environments of quasarswith respect to galaxy clusters, and environment evolution with redshift andluminosity. The orientation of the quasar with respect to the major axis of theclosest cluster was calculated, introducing new information to previous work.The aim of this work was i.) to study the large scale environment over a largeredshift range, ii.) to study the evolution as well as any change inenvironment with quasar luminosity and redshift, and iii.) to study theorientation of a quasar with respect to a galaxy cluster.  There is a deficit of quasars lying close to cluster centres for 0.4<z<0.8,indicating a preference for less dense environments, in agreement with previouswork. These is no change with redshift (over 0<z<1.2) in the positions of thequasars as a function of absolute quasar magnitude, nor preferred orientationbetween the quasar and the cluster major axis for bright or faint quasars.  Spectra of a selection of 680 star forming galaxies, red galaxies, and AGNwere taken, and used to study the environments of quasars with respect tostar-forming galaxies and galaxy clusters. The objects were classified (33classed as AGN), and star formation rates calculated. Three AGN and 10 starforming galaxies lie at the same redshift (z=0.29) as three galaxy clusters.The three galaxy clusters have the same orientation angle and may be part of afilament along with the star forming galaxies and AGN.  A number of high redshift quasars showed evidence of ultra-strong UV FeIIemission in their spectra in the direction of three LQGs in the redshift range1.1<z<1.6, including the Clowes-Campusano Large Quasar Group (CCLQG). Thoughthere has been no previous indication that the LQG environment is unique, thehigh level of iron emission may indicate a difference in environment.

The Cluster and Large Scale Environments of Quasars at z<0.9