© 2019 by Impactive Associates Ltd

Company number 10641308, registered in England. ​



Meet the team

Impactive Associates was established to help investment firms, no matter what size, make their transition to responsible investment more straightforward and rewarding. As practitioners, our aim is to equip our clients with the knowledge and tools they need for responsible investment to flourish organically at their firms. In order to do so effectively, we take the time to fully understand their business, challenges, culture and strategy.

Mais Callan

Founding Director

Mais has over 12 years' experience in responsible investment. She led the ESG integration and research programme at one of the UK's leading asset management firms, Hermes Investment Management. She has advised some of the world's most prominent pension funds on stewardship, and represented them in board-level engagements with listed corporations in Europe and Emerging Markets. She also worked with policy makers to develop and promote best practice in sustainability and responsible investment.  Mais’ expertise also includes integrated reporting and developing quantitative and qualitative ESG research tools.


Mais holds a Masters in Diplomatic Studies from the University of Westminster and a BA (Hons) in Economics, International Business and French from the University of Surrey. She is fluent in French, Spanish and Arabic. She is a Committee member of the Institute of Directors' Young Director's Forum (IoD YDF) and a member of Women in Business and Finance.

Bess Joffe

Senior Advisor

Bess has nearly two decades’ experience working in corporate governance and stewardship.  She has held senior roles on both the institutional investor side - at Hermes and TIAA-CREF - and the corporate side, having led the corporate governance silo for Goldman Sachs’ Investor Relations team during the immediate aftermath of the financial crisis.  Bess hails originally from Toronto and she is a qualified Canadian lawyer.  In addition to being based in London for the past 13 years, she has also previously lived in New York City.

Paul Bisping

Senior Advisor

Paul has over 30 years of financial sector experience across both the brokerage and asset management industries. He was an Executive Director at Hermes Pensions Management responsible for investing in excess of £8bn in active equities as Head of Global Equities and Emerging markets. Paul has been a trustee of a major pension fund and a director of several public companies over the years. He currently manages global investments, lectures as a part-time visiting lecturer for three universities, consults for Armstrong Bonham Carter, is a recognised expert on the UK Takeover Code and has numerous philanthropic interests. Those include the Frontrunner program for disabled students at Common Purpose, a mentor at IntoUniversity and a volunteer at the Challenge Group. Paul graduated first in his undergraduate degree in Economics at UEA and has a Masters from Essex University in Mathematical Economics.

Helena Bergstrom

Senior Consultant

Helena has over 10 years’ experience in impact investing, ESG and sustainability. Throughout her career, she has carried out extensive company, industry and thematic ESG investment risk analysis. Communicating ESG risks and opportunities externally and internally has been an integral part of her work. Helena has held roles at a highly-respected international ESG research and ratings provider as well as at a thought-leader in ESG engagement services. She has covered some the world’s major financial institutions in her analysis, provided research to leading investors and represented institutional investors in ESG engagement meetings with high profile directors. Most recently she has created the building blocks for a risk and performance framework (ESG, SDG and impact assessment) for an emerging markets focused impact investment fund.

Helena holds a Swedish Masters in Law from Uppsala University and an Australian Diploma in Law from the University of Sydney. She speaks fluent English, German and Swedish and has lived and worked in China, Australia, the UK, Austria and Sweden.

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