In 1789 the secretary was authorized to hire "one principal clerk." This principal clerk, or chief clerk, for many years served primarily as a reading clerk on the Senate floor. But during the 1960s, in response to the secretary's growing administrative duties, the position evolved into that of assistant secretary of the Senate, who oversees the administration of the Secretary's Office, including computers and the secretary's web site. The assistant secretary also performs the functions of the secretary in his or her absence. During the 1960s, under the leadership of Francis R. Valeo, staff positions under the secretary of the Senate were redefined from patronage to professional status, a trend continued by Valeo's successors.