David Wallace and Ian McHarg founded the Philadelphia design firm Wallace-McHarg Associates in 1962. Thomas A. Todd and William H. Roberts were made partners in 1963.
Renamed Wallace, McHarg, Roberts and Todd in 1965, this design firm led the fields of city planning, urban design and landscape architecture during the 1970s by approaching design from an ecological perspective. After Ian McHarg resigned from the firm in 1979, he established his own practice. The firm continued under the name Wallace, Roberts & Todd.
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