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HoloHouse Team

Miriam Markús Johansson, VD HoloHouse

Miriam Márkus-Johansson


More than 20 years of experience within environmental issues and sustainability, of which 18 were spent as an international lobbyist at the EU-Commission and in the international environmental organisation. Educated within law, specifically within environmental law as a specialist and environmental science pabyggnad. Enjoys painting, sewing, squash and running.


+46 (0)31 300 03 93

Holohouse | Helena Callstam HR & Rekrytering

Helena Callstam

Head of HR & Recruitment

Helena has been with HoloHouse since 2010 and implemented hundreds of projects. An academic background in environmental science and a specialisation in business economy and labour law. Earlier work experience in accounting and HR with Team Sportia. Passionate about social sustainability, staff management and employer branding. HoloHouse´s padel expert and home decoration specialist.


+46 (0)31 300 03 94

Holohouse | Marcelo Pino Guerrero

Marcelo Pino Guerrero


Marcelo has a background in environmental science with a specialisation in business economics. He is project coordinator at HoloHouse and is in particular passionate about social sustainability issues. He is the team´s specialist in circular economy issues. He has been running a number of regional projects such as 7H Kompetens (Region Borås) and Looperate (Region Halland).


+46 (0)31 361 69 03


Elin Ekström


Elin has worked for HoloHouse for three years already. She has a background in environmental science with a specialisation in environmental economy. She is amongst others running projects in the region of Borås. Elin loves gardening and spending time with her family!


+46 766 12 17 51

Amelie Klamm


Amelie is a curious communication student from Germany studying the second year of the Master in Communication at GU. She did her internship with us during the fall semester 2023 and continues to work with our social media, communication and various projects. She is interested in intercultural communication and project management and in her free time she loves to play flag football.



My Duvling


My is a newly graduated student from the Social Science Environmental Science programme with a focus on human ecology. She is also studying GIS and environmental management systems. During the autumn of 2023, she did an internship with us and will continue to work as a student employee in the Kompetenslyftet project. In her spare time, she likes to play Spikeball or go snowboarding.




Sonja Henriksson

Sonja grew up in Tjörn and in Connecticut, USA. She studies Civil Engineering and a master programme in Industrial Ecology at Chalmers University of Technology. In her spare time, she practices karate and loves to bake and cook.

Tova Karlsson

Tova pluggar Samhällsvetenskapligt miljövetarprogram med inriktning Uthålligt företagande och har ett starkt intresse för hållbar utveckling. Utöver skola och jobb gillar hon att umgås med vänner och familj, träna, vara i naturen och att testa nya saker.

Sofia Wartenberg

Sofia läser sista året till civilingenjör inom teknisk fysik på Chalmers. På grund av hennes intresse för hållbarhetsfrågor har hon valt att läsa masterprogrammet Industriell Ekologi, där hon lärt sig att applicera ingenjörstänk på frågor som handlar om hållbarhet och miljö.


Ellinor Kleiven

Ellinor studies Biotechnology Engineering at Chalmers University of Technology.


Emil Lundgren

Emil studies a master in Industrial Ecology at Chalmers University of Technology.

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