Woman-owned since 2002 and certified as a Small Business Enterprise by the California DGS, McCullough Landscape Architecture has operated since its 1999 founding and in 2022 relocated to the historic Design Center at 3605-B Fifth Ave, the 1949 Lloyd Ruocco-designed mid-century building carrying City of San Diego Historical Resource Site designation. The firm's practice spans master planning, urban design and environmental planning on parks, campuses and streetscapes across California and internationally, a public-realm and agency-contract orientation that contrasts with the cross-border Baja residential and contemporary-hardscape focus of the studio at Sotelo Landscape Architects a few blocks south on Fourth Ave. Additional certifications include Woman Owned Small Business (WOSB) with the U.S. Small Business Administration and Small Local Business Enterprise (SLBE) with the City of San Diego, qualifying the firm for set-aside pursuits on federal and municipal contracts. McCullough's portfolio runs to international environmental-planning projects and California public parks, a scope that does not overlap with ballpark-scale civic commissions such as the Gallagher Square redesign at Petco Park delivered by GroundLevel Landscape Architecture from its Little Italy office at 2605 State Street. The studio also occupies the Futuro Space design-tenant campus inside the same Design Center building, a preservation-adjacent work environment the firm helped revitalize alongside architecture firm RDC and Blue Sapphire Holdings. The most demanding commissions are multi-acre campus masterplans and environmental mitigation sites requiring CEQA-level documentation, plant-palette specification for native habitat restoration, and multi-year construction administration from concept through punch list.