Altruism is defined in Chambers Dictionary as the principle of living and acting for others. The career of altruism can be considered in relation to the individual probation practitioner and the probation service, albeit in different ways. The purpose of this paper is to rehearse some of the ideas of the late Bill McWilliams, to suggest their continuing relevance to probation, and to argue how his thinking might have developed had his active life been longer. Altruism in its appeal to selflessness, and its lack of discrimination between the categories of other to be served, offers a reasonable organising principle in probation, of which Bill would have approved, and which will be elaborated somewhat in the final section of the paper.The late Victorian ancestor of the probation officer was the police court missionary. The first missionaries were employees of the Church of England Temperance Society. As Bill McWilliams (1983) stressed:The missionaries had a religious philosophy, distinctively their own, and when they first entered the summary courts their transcendent task was the saving of souls through divine grace. (p. 130) Their task was the restoration and reclamation of individual drunkards appearing before the criminal courts. (p. 134) This role was compromised by magistrates' use of missionaries to supervise offenders released on recognizances under the provisions of the Summary Jurisdiction Act 1879. The next step was the use of missionaries to undertake pre-sentence reports. Bill (1983) quoted the annual report of the London Police Court Mission for 1889 as follows:the missionaries are at the court for some time before the magistrate takes his seat on 2