| 1946 |
William Russell Kelly opens a service bureau to meet the office clerical needs of Detroit-area businesses. |
| 1953 | Sales exceed $1 million. |
| 1954 |
First branch office opens in Louisville, Kentucky. |
| 1957 |
Company is renamed Kelly Girl Service, Inc.
|
| 1962 |
Company becomes publicly owned; stock is traded over-the-counter. |
| 1965 | Branch office opens in San Juan, Puerto Rico. |
| 1966 | Company changes name to Kelly Services, Inc. |
| 1967 | Terence E. Adderley elected President. |
| 1968 | First international office opens in Toronto, Ontario, Canada; Kelly Services, Ltd. formed. |
| 1972 | First European office opens in Paris, France. |
| 1973 | Office opens in London, England. Sales exceed $100 million. |
| 1976 | Acquires Home Care, Inc. |
| 1979 |
Kelly Services has offices in all 50 states with the opening of the Burlington, Vermont office. |
| 1986 | Sales exceed $1 billion. |
| 1993 | $2 billion in sales. |
| 1994 | Acquires Your Staff®. |
| 1995 |
Introduces PinPoint, an innovative software teaching and testing system. Acquires The Wallace Law Registry®. |
| 1996 |
Kelly Services, Inc. celebrates 50th anniversary.
Exceeds $3 billion in sales. |