"By their fruits, ye shall know them". Read his publications below, and Wikipedia listing

  "Gathered For Power"  by Graham Pulkingham (196 page PDF)
      Morehouse-Barlow Co. 1972.  ISBN 0-8192-1130-3

  "They Left Their Nets: A Vision for Community Ministry"  
      by Graham Pulkingham (free download as 159 page PDF)
      Hodder & Stoughton Limited, 1974. ISBN 0-340-18553-8

   "Renewal: An Emerging Pattern"  by Graham Pulkingham
       & Jeanne Hinton  ISBN 0-906309-10-7

  "Church of the Redeemer, Miracle in the Inner City"
      ACTS Magazine (download as 11-page 6.2 MB PFD file)