Our writers

Steven Bowen - Sustainable investing and strategy

One of the founders of The Sustainable Investor. After starting as an engineer, he has built nearly 30 years' experience in the finance and investing world, including periods in corporate finance, debt markets, broking, and as a buy side portfolio manager. His focus is on the importance of company strategy, and how to construct investment cases in an uncertain world (and the transitions are the biggest uncertainty of all), plus he is a massive advocate for active engagement.

Steven is a qualified engineer (Canterbury University NZ), with an MBA from London Business School & the post graduate FT Non-Executive diploma. He is also a columnist at illuminem.


Sandy Jayaraj - Sustainability intelligence and finance

Sandy Jayaraj - click to see more

Sandy Jayaraj is an experienced C-Suite executive and leader with broad multi-national industry and corporate experience. He had a 25-year career in financial markets at PricewaterhouseCoopers and Morgan Stanley enhanced by four years as COO, then CEO building Curation Corp into a trusted sustainability intelligence enterprise. He brought that experience to bear in founding Perspectrum Advisors in 2022.

By employing lateral thinking, evaluating methods and an ability to communicate complex topics in a concise, relevant and understandable way, Sandy enables organisations to find new perspectives, garner new insights and make more sustainable decisions.

Sandy is a published journalist having written on emerging themes and sustainability for various publications including IR Magazine, Illuminem and Energy World, a publication of the Energy Institute. Sandy studied Engineering and Management Studies at Queens’ College, Cambridge University.


Ffiona Devasabai - Psychology & sustainability transitions

Ffiona Devasabai - click to see more

Ffiona’s specialisation is in applying psychology to accelerate sustainability transitions. She partners with investors, business and public sector leaders to do so. Her work tends to involve helping leadership teams define and align on their strategy, strengthening board and team effectiveness or ensuring organisations have the right skills and mindset in place to achieve their sustainability plans.​

For the past 5 years she has been working as a leadership strategy consultant and coach at YSC Consulting, partnering mainly with FTSE 100 corporations as well as private equity investors. Before that she led organisational change initiatives within the education & youth justice sectors in Ireland and Canada. Earlier in her career she designed coaching and development programmes for early stage social entrepreneurs.

She is a qualified International Coaching Federation coach, having trained in individual coaching and systemic team coaching at the Academy of Executive Coaching. She holds a BA in European Social and Political Studies, with a specialisation in law from University College London, a PGDip in Organisational Psychology from Birkbeck College (University College London) and has studied Circular Economy and Sustainability Strategies with Cambridge Judge Business School. She works with English, French & Spanish speaking clients, with experience in navigating intercultural leadership issues.


Kristina Touzenis - Human rights law and practice

Kristina Touzenis - click to see more

Kristina Touzenis is a lawyer and a recognized leader in the effective and concrete operationalisation of international human rights standards and principles in complex settings worldwide requiring long term engagement with a multitude of stakeholders, from both the public and private sectors. She has more than 20 years of experience in advocacy, human rights reporting, monitoring, and evaluating as well as in policy making and negotiating at national, regional, and global levels.

Kristina created the International Law Unit at the International Organization for Migration - IOM, the UN Agency for Migration, and served as Head of the Unit from 2011 to 2020. In that role, she built internal organization-wide policies and guidance for offices worldwide on how to operationalize, report, and monitor impact of programmes from a rights-based perspective, developing indicators and methodologies to measure and leverage benefits to broader societies and beneficiaries. She also engaged with government counterparts on legislation development and review as well as with other Agencies within the UN common system, on advocacy and implementation of programmes worldwide. Before this Kristina worked from 2006-2011 in IOM in Rome and from 2002-2006 on children's rights in the MENA region.

Over the past two years Kristina has supported private sector actors reviewing/amending and improving their sustainability strategies and efforts, specifically focusing on social sustainability and good governance. She is currently Senior Consultant for the UNODC and UNICEF and Associate Director with Strategia Worldwide