The World Database of Happiness developed in the 1980s. Over the years the following people have added to this source.
| Amsterdam (Karien) | student volunteer | Entry of Correlational Findings | 1990 |
| Arampatzi (Effi) Msc | junior researcher | Entry of Correlational Findings | 2015-2016 |
| Bakkeren-Zofcsik (Herta) drs. | senior volunteer | Entry of Correlational Findings | 1999-2004 |
| Baldew (Lucette) drs. | trainee | Entry of Correlational Findings | 1990 |
| Balhuizen (Piet) ir. | volunteer | Entry of Correlational Findings | 1999-2000 |
| Bergsma (Ad) dr. | senior researcher | Research synthesis, Data analysis | 2012-2015 |
| Berg (Maarten) dr. | junior researcher | Analysis of findings on Happiness in Nations | 2004-2010 |
| Blok (Anneke) | senior volunteer | Bibliography | 2005-2019 |
| Boelhouwer (Cunie) | senior volunteer | Bibliography | 2007-2012 |
| Booij (Alexandra) drs. | senior volunteer | Entry of Correlational Findings | 2007 |
| Borst (Gerard) drs. | trainee | Entry of Correlational Findings | 1989 |
| Brule (Geal) dr. | PhD candidate | Analysis of Happiness in Nations, focus on freedom | 2010-2015 |
| Buijt (Ivonne) (drs) | managing director | Bibliography, Office management | 2017-2023 |
| DenBuitelaar (Carla) | senior volunteer | Bibliography, Office management | 1990-2015 |
| Choi (Yowon) MA | researcher | Entry of Correlational Findings | 2003-2006 |
| Elia (Armand) | senior volunteer | Entry of findings on Happiness in Nations | 2008-2011 |
| DeHeer (Henk) | senior volunteer | IT, database design | 1997-2006 |
| DeJonge (Tineke) (dr.) | senior volunteer | International Happiness Scale Interval Study | 2011-2019 |
| DeKoster (Willem) | student assistant | Entry of findings on Happiness in Nations and States of Nations | 2002-2004 |
| DeLang (Tineke) | senior volunteer | Text processing, Bibliography | 1990-1993 2016-2017 |
| DeVries (Astrid) | student volunteer | Entry of Correlational Findings | 1995 |
| Dijkstra (Nanning) drs. | senior volunteer | IT | 1991-1996 |
| Eberth Juliane) | trainee | Entry of Correlational Findings | 2009 |
| Ehrhardt (Joop) ir. | Senior volunteer | Entry of Correlational Findings, Statistics, data analysis | 1989-1995 |
| Euverman (Teije) (dr.) | senior volunteer | Statistics | 2018-2022 |
| Godoy (Deborah) dr. | trainee | Entry of Correlational Findings, Happiness Scale Interval Study | 2009 |
| Gokdemir (Ozge) dr. | trainee | Entry of Correlational Findings | 2009 |
| Graven (Elly) | data typist | Text processing | 1982-1983 |
| Hagendoorn (Tom) drs. | volunteer | Entry of Correlational Findings | 1985 |
| Hendriks (Martijn) Msc | junior researcher | Entry of Correlational Findings Research synthesis on Happiness and Migration | 2015-2016 |
| Herwig (Leo) | senior volunteer | Text processing | 1999-2000 |
| Hidskes (jeanne) | secretary | Text processing | 1976-1982 |
| Hordijk (Hans) | student volunteer | Entry of Correlational Findings | 1986 |
| Huijsmans (Tineke) drs. | senior volunteer | Entry of Correlational Findings | 2008-2013 |
| Jalink (Marijke ) drs. | trainee | Entry of Correlational Findings | 1991 |
| Jansen (Henk ) mr. | senior volunteer | Entry of Correlational Findings | 2000 |
| Jansen (Ton) | volunteer | Text processing | 1989 |
| Jonkers (Ton) | student assistant | Entry of Correlational Findings | 1978-1982 |
| Kalmijn (Wim) dr. ir. | senior volunteer | Statistics. Focus on Happiness Scale Interval Study | 1998-2015 |
| Karatas (Esra) Msc. | PhD candidate | Entry of Correlational Findings Focus on happiness of elderly migrants | 2013 |
| VanKempen (Loes) dr. | senior volunteer | Entry of Correlational Findings | 2014-2015 |
| Koopman (Janna) | Senior volunteer | Bibliography | 2006-2020 |
| Kroon (Thea) | volunteer | Bibliography | 1988-1990 |
| Lans (Ems) mr. | senior volunteer | Entry of Correlational Findings | 1998-1999 |
| Lelieveldt-Pot (Tonny) drs. | senior volunteer | Entry of Correlational Findings | 1998-2001 |
| Ligthart (Aart) drs. | senior volunteer | Entry of Correlational Findings | 2001 |
| Lips (Mirjam) | student volunteer | Entry of Correlational Findings | 1990-1991 |
| Metz (Bernard) MD | senior volunteer | Entry of Correlational Findings | 2003-2006 |
| Mieras (Hans) ir. | senior volunteer | Entry of Correlational Findings | 1998-2012 |
| Moors (Bart) | student volunteer | Entry of Correlational Findings | 1984 |
| Mulder (Joop) | senior volunteer | Text processing, Documentation | 1985-2020 |
| Nagtegaal (Bas) | senior volunteer | Entry of Correlational Findings | 2018-2019 |
| Noordergraaf (Mirko) | student volunteer | Entry of Correlational Findings | 1989 |
| Okma (Pietrica) drs. | senior volunteer | Data analysis, Happiness and Age | 1997-2000 |
| Ouweneel (Piet) (drs) | senior volunteer | Entry of Correlational Findings, Data analysis | 1985-2021 |
| Propp (julia) | trainee | Entry of Correlational Findings | 2009 |
| Rakic (Bettinka) | student volunteer | Entry of Correlational Findings | 199? |
| Schinkel (Willem) | student assistant | Entry of findings on Happiness in Nations | 1998-2000 |
| Schultz (Ida) | student intern | Entry of Correlational Findings | 2013 |
| Schuppen (Gerrit) | volunteer | Entry of findings in States of Nations | 1995 |
| Shinnick (Jessica) MA | volunteer | Entry of Correlational Findings | 2005 |
| Smit (Sander) | student assistant | Entry of findings on Happiness in Nations and States of Nations | 2000-2002 |
| Smeets-Wong (Joyce) Bsc. | senior volunteer | Entry of Correlational Findings | 1994-1995 |
| Stevens (Henrik) | student volunteer | Entry of Correlational Findings | 1989 |
| Sie Dhian Ho (Monica) | student volunteer | Entry of Correlational Findings | 1992 |
| Strubbe (Inge) drs. | trainee | Entry of Correlational Findings | 1991 |
| Swellengrebel (Arien) | senior volunteer | Text processing | 2001 |
| Swier (Ruud) | senior volunteer | Entry of Correlational Findings | 2000 |
| Timmermans (Desiree) | trainee | Entry of Correlational Findings | 1997 |
| Teeuw (Marcel) | student volunteer | Entry of Correlational Findings | 1991 |
| Thaens (Marcel) | student volunteer | Entry of Correlational Findings | 1989 |
| VandenBerg (Devorah) | trainee | Entry of Correlational Findings | 2008 |
| VanderJagt-Dragt (Elly) drs. | senior volunteer | Entry of Correlational Findings | 2004 |
| VanHecke (Treze) mr.lic. | senior volunteer | Entry of Correlational Findings | 2007-2012 |
| VanKempen (Loes) dr. | senior volunteer | Entry of Correlational Findings | 2014-2015 |
| VanKooten (Gerrit) | student assistant | Entry of Correlational Findings | 1980-82 |
| VanKooten (Pascal) | student volunteer | Entry of Correlational Findings | 2011 |
| VanLuyn (Heleen) | trainee | Entry of Correlational Findings | 1987 |
| VanderPoel (George) MD dr. | senior volunteer | Entry of Correlational Findings Focus on health | 2007-2012 |
| VanRijswijk (Agnet) | senior volunteer | Text processing | 1991 |
| VanSchoonhoven (Renee) | student assistant | Entry of Correlational Findings | 1984 |
| VandeVooren (Jan) dr. | senior volunteer | Meta-analysis | 2006-2020 |
| VanderVlugt (Frank) (ir.) | senior volunteer | Entry of findings on Happiness in Nations and Correlational Findings | 2009-2022 |
| Vijverberg-VanLeeuwen (Stanny) | senior volunteer | Bibliography | 1997-2008 |
| Hector Vargas (Hector) dr. | visiting scholar | Happiness in Nations, focus on entry data Latin America | 2011-2013 |
| Vis (Prisca) drs. | volunteer, PhD student | Bibliography Research synthesis of psychological strengths | 2011-2014 |
| Wartena (Paul) drs. | researcher senior volunteer | Entry of findings on Happiness in Nations, Happiness in Regions and States of Nations | 2000-2016 |
| Weijenborg (Philo) mr. | senior volunteer | Entry of Correlational Findings | 1998 |
| Wildschut (Gerard) | senior volunteer | Entry of findings in States of Nations | 2008-2019 |
| Wissel (David) | student assistant | Entry of Correlational Findings | 1990 |
| Wijnbelt (Mariska) | student volunteer | Entry of Correlational Findings | 1991 |
| Zijlmans (Teun) MA | volunteer | Bibliography | 2009 |
| Zuidgeest (Ems) (MD) | senior volunteer | Bibliography | 2008-2021 |
| Zweerus (Hanna) drs. | trainee | Entry of Correlational Findings | 1989 |