watson became the first government actuary in 1917, gaining influence with the expansion of national insurance, particularly with regard to pensions. he worked inside hm treasury, and was seen to be aligned with the department's desire for more control over social policy. the government actuary's department was created in july 1919. during the time he held the role, no social policy could become law without his approval. he was often consulted by all government departments on subjects, including subjects outside his specialism.