Third Hemisphere

Operating out of Sydney with additional offices in Melbourne and Singapore, Third Hemisphere works across the APAC region with B2B companies and impact-driven organisations seeking to build authority and shape public narratives. Founded in 2015, the agency positions itself as an integrated PR, marketing and communications partner rather than a single-discipline shop, and runs with a small team. The Singapore office covers Singapore and South East Asia and is led by APAC Lead Natalie Chua, formerly Managing Director at Redhill, handling regional media relations and multi-market campaigns alongside the Australian team. Declared capabilities span search engine optimization, branding, content marketing, email marketing, public relations and social media marketing, organised internally around seven core pillars: media coverage, thought leadership, crisis management, digital marketing, content marketing, and investor relations. A separate practice, called The Fourth Hemisphere, focuses on marketing for AI: it takes a client's existing marketing strategy as its starting point, audits it against 50 buyer questions across five AI engines (ChatGPT, Claude, Gemini, Copilot and Perplexity), and scores results using a PACT framework covering Presence, Authority, Consensus and Truth. This audit is then used to direct work across in-house teams and other retained agencies. The agency cites experience across more than 150 clients and over 20,000 media placements.