| Dates | Name | Participants | Notes |
| 1857 – 1865 | (informal cooperation) | Frederick Law Olmsted Calvert Vaux | No evidence of a formal partnership appears to exist |
| 1865 – 1872 | Olmsted, Vaux & Co. | Frederick Law Olmsted Calvert Vaux | Olmsted and Vaux belonged to each other’s firms |
| 1865 – 1872 | Vaux, Withers & Co. | Calvert Vaux Thomas Withers Frederick Law Olmsted | Olmsted and Vaux belonged to each other’s firms |
| 1872 – 1884 | Frederick Law Olmsted | Frederick Law Olmsted | Olmsted worked with several notable non-partner associates, including George Kent Radford and John Charles Olmsted (his adopted son) |
| 1884 – 1889 | F. L. & J. C. Olmsted | Frederick Law Olmsted John Charles Olmsted | John Charles Olmsted raised to full partner |
| 1889 – 1893 | F. L. & J. C. Olmsted | Frederick Law Olmsted John Charles Olmsted Henry Sargent Codman | Henry Sargent Codman died 1893 |
| 1893 – 1897 | Olmsted, Olmsted & Eliot | Frederick Law Olmsted John Charles Olmsted Charles Eliot | Frederick Law Olmsted retired from active practice in 1895 Charles Eliot died 1897 |
| 1897 – 1898 | F. L. & J. C. Olmsted | John Charles Olmsted Frederick Law Olmsted, Jr. | New firm, reusing a previous name of the firm |
| 1898 – 1920 | Olmsted Brothers | John Charles Olmsted Frederick Law Olmsted, Jr. James Frederick Dawson (assoc., 1904) Percival Gallagher (assoc., 1904) | John Charles Olmsted died 1920 |
| 1920 – 1957 | Olmsted Brothers | Frederick Law Olmsted, Jr. James Frederick Dawson (assoc.; partner in 1922) Percival Gallagher (assoc.; partner, 1922) Edward Clark Whiting (assoc., 1920, partner 1927) Henry Vincent Hubbard (partner, 1927) William B. Marquis (partner, 1937) Carl Rust Parker (partner, 1950) Partridge Richardson (partner, 1950) Charles Scott Riley (partner, 1950) | Frederick Law Olmsted, Jr. retired from active practice in 1949 but remained a partner Frederick Law Olmsted, Jr. died 1957 Percival Gallagher died 1934 Henry Vincent Hubbard died 1947 Firm reorganized upon death of Frederick Law Olmsted, Jr. , 1957 |
| 1957 – 1961 | Olmsted Brothers | James Frederick Dawson Percival Gallagher William B. Marquis Edward Clark Whiting Carl Rust Parker Partridge Richardson Charles Scott Riley | Carl Rust Parker retired 1960 Charles Scott Riley retired 1961 William B. Marquis retired 1962 Firm dissolved, 1961 |
| 1962 – 1979 | Olmsted Associates | Partridge Richardson Joseph George Hudak Erno J. Fonagy (assoc.) | Firm dissolved, 1979 |
| 1980 – 2000 | The Olmsted Office | Partridge Richardson | Practice closed, 2000 |
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