About Third Hemisphere
Third Hemisphere was founded by Hannah Moreno with a clear vision: to create a PR and communications agency that builds the kind of authority and trust that organisations need to grow.
From the beginning, Third Hemisphere has been drawn to brands building a better future. The technology companies solving problems no one else is solving. The sustainability ventures proving that commercial success and positive impact are not mutually exclusive. The founders who believe their work matters beyond their balance sheet. Working with impact-driven organisations is who we have always been.
Third Hemisphere is the integrated PR, marketing, AI Authority & Visibility, and investor relations agency helping ambitious companies grow, from Sydney, Melbourne, and Singapore. Founded in Sydney in 2014, it is a Certified B Corporation, publishes the AI Authority Index, and won Boutique/Small PR Agency of the Year at the 2023 Mumbrella CommsCon Awards. We are the Agency of Change: a communications partner for organisations that are doing something that matters, and need the world to know it.
Under Hannah's leadership and with Jeremy Liddle as Executive Chair, Third Hemisphere has grown into one of Australia's most respected boutique agencies for impact-driven and innovation-economy organisations.
By the numbers
- 150+ Clients Served
- 20,000+ Media Placements
- 64+ Years Combined Experience
- 3 Offices in APAC
One story, every channel
- Media Coverage & PR Earned media placements across national, trade, and international outlets to build credibility and visibility.
- Video Content Compelling video assets for social, investor presentations, and brand storytelling that bring your narrative to life.
- Thought Leadership Bylines, opinion pieces, speaking engagements, and expert commentary that position your leadership as industry authorities.
- Social Media Strategic organic and paid social campaigns across LinkedIn, X, Instagram, and emerging platforms to amplify reach.
- Email & Newsletters Targeted email campaigns, investor updates, and newsletter programmes that nurture relationships and drive action.
- Stakeholder & Partner Comms Tailored communications for investors, board members, government, partners, and other key audiences.
Leadership
Hannah Moreno
Founder & CEO
Hannah is our specialist author, editor, and social justice advocate, in charge of thought leadership for clients and Third Hemisphere. She has 20 years' experience across the gamut of communications disciplines, and has authored and placed hundreds of editorials for clients in Tier-1 media. This has included ghostwriting at the Australian Financial Review, and turning clients into official AFR Columnists.
She is also a columnist at Stockhead and The Australian, and regularly contributes to Women's Agenda. Hannah holds a Bachelor of Commerce (USYD and Università Bocconi), a Masters of Strategic Public Relations (USYD), and a Diploma of Investor Relations (AIRA).
Jeremy Liddle
Executive Chair
Jeremy heads business development and strategy for Third Hemisphere as our capital markets, growth, climate, finance, and technology specialist. He is a founding partner of climate tech investment and advisory firm SDGx, has invested in 25+ tech and climate startups and multiple venture funds, and was President for Australia at the G20 Young Entrepreneurs Alliance.
He also spoke at TEDx, authored the book "From Idea to Startup", and has worked extensively with the UN including co-authoring the G20 and UN white paper on youth entrepreneurship and participating in the formation of the Sustainable Development Goals (SDGs). Jeremy holds a Bachelor of Business (Monash) and a Graduate Diploma of Finance (Griffith).
Rachael Cassidy
USA Lead
Rachael Cassidy is USA Lead at Third Hemisphere, based in Oregon. She is one of the only Australians to have worked at the very top of the US PR industry, representing some of the biggest Australian and US technology brands.
Most recently she was Executive Vice President and General Manager at Bateman Agency, leading global communications strategy, narrative development, executive thought leadership, and C-suite counsel across a multi-million dollar client portfolio. During her tenure the agency was named the San Francisco Business Times 2023 Fastest Growing Private Company in the Bay Area, ranking first on the FAST 100 list, the first PR firm to top it.
Before Bateman she spent over six years at Mission North in San Francisco, rising to Senior Vice President and Corporate Reputation Practice lead, where she led communications for Snowflake's record-breaking NYSE debut and Ping Identity's IPO and built the firm's Corporate Reputation and Future of Work practices.
She has counselled executives at Atlassian, Canva, Google Cloud, Gusto, Smartsheet, Workato, and 2U, and served as interim Head of Communications at Checkr. Rachael began her career in Australian broadcast journalism, anchoring live news as News Director at the Macquarie Radio Network and News Producer on Seven's Sunrise.
She holds a Bachelor of Communications (Media) from Western Sydney University and a Graduate Diploma in Radio Broadcasting from the Australian Film Television and Radio School.
Team
- Isla Tweed Account Director
- Priyanka Dogra Senior Account Manager
- Marika Kishimoto Japan Lead
- Hanna Tiensuu Account Executive
- KC Igna Operations Manager
- Vin Mendoza AI & Systems Manager
- Cath Casaway-Hormillosa Executive Assistant
A team of 10, with offices in Sydney, Melbourne, and Singapore.
Awards
- Third Hemisphere: Winner: Boutique/Small PR Agency of the Year, Mumbrella CommsCon Awards 2023
- Third Hemisphere: Winner: Best in Financial Services (Consumer Services), Asia-Pacific SABRE Awards 2023 (Super Fierce)
- Hannah Moreno: Winner: Technology Woman of the Year, B&T Women Leading Tech Awards 2024
- Hannah Moreno: Winner: Public Relations category, B&T Women Leading Tech Awards 2024
- Hannah Moreno: Winner: PR Professional of the Year, Mumbrella CommsCon Awards 2023
- Hannah Moreno: Finalist: Public Relations category, B&T Women Leading Tech Awards 2026
- Hannah Moreno: Finalist: PR category, B&T Women Leading Tech Awards 2025
- Hannah Moreno: Finalist: PR Leader of the Year, Mumbrella CommsCon Awards 2024
- Hannah Moreno: Finalist: PR Agency Head of the Year, PR Awards Asia-Pacific 2023
- Third Hemisphere: Finalist: Executive Communications, Asia-Pacific SABRE Awards 2023 (Cicada Innovations)
- Third Hemisphere: Finalist: Executive Communications, Asia-Pacific SABRE Awards 2023 (HB11 Energy)
- Third Hemisphere: Finalist: Energy & Natural Resources, Asia-Pacific SABRE Awards 2023 (HB11 Energy)
- Third Hemisphere: Finalist: Product Media Relations (Consumer Media), Asia-Pacific SABRE Awards 2023 (Super Fierce)
- Third Hemisphere: Finalist: PR Agency of the Year: Mid-sized, Mumbrella CommsCon Awards 2024
- Hannah Moreno: Finalist: Women in Finance Awards 2021
- Hannah Moreno: Power List: Women Leading Tech Power List, B&T Women Leading Tech 2025
Offices
- Sydney Level 3, 180 George Street
- Melbourne Level 27, 101 Collins Street
- Singapore 160 Robinson Road, #14-04 Singapore Business Federation Center
Frequently Asked Questions
Who founded Third Hemisphere?
Hannah Moreno founded Third Hemisphere in Sydney in 2014 and leads it as Founder and CEO. Hannah is the 2024 B&T Technology Woman of the Year and the 2023 Mumbrella PR Professional of the Year. Jeremy Liddle joined four years later and co-founded the agency in its current form as Executive Chair. Jeremy is a TEDx, UN and G20 speaker with deep expertise in venture capital and investor communications.
Both remain actively involved in every client engagement.
How many people work at Third Hemisphere?
Third Hemisphere has a team of 10 PR, marketing, and communications professionals, with offices in Sydney, Melbourne, and Singapore. Our senior-led model means clients work directly with experienced practitioners, including account managers, media directors, and strategy leads, rather than junior staff.
What awards has Third Hemisphere won?
Third Hemisphere won Boutique/Small PR Agency of the Year at the 2023 Mumbrella CommsCon Awards and Best in Financial Services (Consumer Services) at the 2023 Asia-Pacific SABRE Awards. Founder and CEO Hannah Moreno is the 2024 B&T Technology Woman of the Year and the 2023 Mumbrella PR Professional of the Year.
Does Third Hemisphere work with international clients?
Yes. Third Hemisphere works with clients across the Asia-Pacific region including Australia and New Zealand, and regularly supports clients expanding into new geographies through the international media our team works with.
What is the Waterfall Strategy and how does it work?
The Waterfall Strategy is Third Hemisphere's signature methodology. It cascades a single core narrative across every audience: corporate, capital markets, consumer, government, and impact, ensuring consistency and compounding visibility. Each channel amplifies the next, building credibility and emotional connection at scale.
What makes Third Hemisphere different from other PR agencies in Australia?
Third Hemisphere is founder-led with Hannah Moreno and Jeremy Liddle actively involved in every client relationship. We combine strategic depth with hands-on execution, integrate PR with marketing, digital, investor relations, and audience engagement, and use our proprietary Waterfall Strategy to cascade messaging across all audiences simultaneously.