Einfeld has been a spokesperson for Israeli and Jewish causes and has often confronted Palestinian supporters, the media, the United Nations, universities and other institutions. He was an invited speaker at United Israel Appeal (UIA) functions in Britain, the United States of America, Europe, Canada and Australia. He is patron of the Australian Association of Jewish Holocaust Survivors and Descendants and of the Sydney Jewish Museum.
In 2002 Einfeld was presented a United Nations Association of Australia Founder's Award for his contribution to justice and human rights.
Einfeld was the President of Australian Legal Resources International, a non-profit independent group of lawyers that supported democracy, human rights and the rule of law in developing countries. In August 2006 this organisation collapsed, leaving creditors, including AusAID, the Australian Taxation Office, and St George Bank "thousands of dollars out of pocket.
In August 2006, Einfeld contested a speeding ticket by claiming he had lent his car to an old friend, Professor Teresa Brennan, at the time it was caught by a speed camera; he also signed a statutory declaration to that effect. (While the fine was only $AUD77, a conviction would have left Einfeld with only one demerit point on his driver's licence.) However, it was later revealed that Professor Brennan had been killed in a road accident in the United States in January 2003.
In September 2006, Einfeld gave the NSW police leave to search his Woollahra home as part of their investigation of his evidence in the speeding case. They removed part of his home computer for forensic examination. On March 29, 2007, Einfeld was arrested by the NSW police. He was charged with 13 offences, including perjury, perverting the course of justice and making and using false statutory declarations. Einfeld's committal hearing was held in December 2007. One charge (hindering an investigation) was dropped; Einfeld was committed to stand trial on charges of perjury, perverting the course of justice and traffic offences.
Since his speeding fine case came to attention in the Australian media, Einfeld has been the subject of ongoing media reports alleging various other improprieties, including padding his curriculum vitae, purchasing doctorates from US diploma mills, and plagiarism.