Connie Lee HamelinGregory M Vecchi Ph.D Former FBI Unit Chief in crisis negotiation - he contributed a BISM model; shared an incident and interview . https: //www.vecchigroup.com Paul Wai Ching Wong D.Psyc. (clinical) - he contributed an introduction on suicide prevenion in Hong Kong; and he shared an interview. https: //www.socialwork.hku.hk/paulwong/ Gilbert Wong Ph.D Former Commanding Officer of the Police Negotiation Cadre of the Hong Kong Police Force - co-author. https: //www.facebook.com/people/HypnoHealth-Consulting-Limited-思健意療/100078334429220/ Tang Ping Keung, Chris GBS PDSM JP Secretary for Security of the Hong Kong SAR, Former Commissioner of Police of the Hong Kong Police Force - he contributed a preface. https: //www.gov.hk/en/about/govdirectory/po/ss.htm Lee Ming Kwai GBS QPM CPM Former Commissioner of Police of the Hong Kong Police Force. - he contributed a preface. https: //www.hkjcdpri.org.hk/mr-lee-ming-kwai-dick Karma Castilho An artist in hypo-paintings - she contributed a number of paintings. https: //www.gallerykarma.com Read More Read Less