Manasserian joined the Patterson & O'Neill firm to bolster its capabilities in California land use, environmental law, and complex entitlement strategy. His professional track record includes navigating zoning, planning, and state housing mandates such as the State Density Bonus Law and the Starter Home Revitalization Act. According to managing partner Ryan Patterson, this recognition underscores the depth of experience Manasserian brings to the firm’s ongoing work with developers and community stakeholders.

This appointment follows a period of notable recognition for the firm’s leadership. In 2025, founding partners Ryan J. Patterson and Brian O'Neill were included in The Daily Journal’s list of top real estate lawyers for their work enforcing state pro-housing legislation. The firm recently established a presence in the historic Fine Arts Building in downtown Los Angeles to remain in proximity to key trial courts and City Hall as it continues to litigate land use disputes.