Theertha is an visual artists' led initiative that was founded by 11 Sri Lankan artists in 2000. Since then Theertha has grown to a fairly large art organization that has a staff of 17 members and managing number of projects simultaneously.

Theertha is administered by a core group of visual artists. Core Group changes when new members are recruited and old members leave making it an evolving entity to ensure fresh ideas and energy.

Founding Core Group -2000

Jagath Weerasinghe (Chairman)

Anoli Perera (Secretary)

Chandraguptha Thenuwara

G. R. Constantine (Treasurer)

Bandu Manamperi

Pradeep Chandrasiri

Koralegedera Pushpakumara

T. P. G. Amarajeeva

Sarah Kumarasiri

Pala Pothupitiya

Anura Krishantha

Core Group -2003

Jagath Weerasinghe (Chairman)
Anoli Perera (Secretary)
Chandraguptha Thenuwara
G. R. Constantine (Treasurer)
Bandu Manamperi
Pradeep Chandrasiri
Koralegedera Pushpakumara
T. P. G. Amarajeeva
Sarah Kumarasiri
Nilanthi Weerasekera
Manjula Priyadharshana
Anura Krishantha
Pala Pothupitiya
Kapila Palihawadana

Core Group -2006

Jagath Weerasinghe (Chairman)
Anoli Perera (Secretary)
G. R. Constantine (Treasurer)
Bandu Manamperi
Koralegedera Pushpakumara
Sarah Kumarasiri (Deputy Chairman)
Nilanthi Weerasekera
Anura Krishantha
Pala Pothupitiya
Kapila Palihawadana
Niranjala Gunasinghe
Thisath Thoradeniya
Prasanna Ranabahu
Sanath Kalubadana

Core Group -2007

Jagath Weerasinghe (Chairman)
Anoli Perera (Secretary)
G. R. Constantine (Treasurer)
Bandu Manamperi
Pradeep Chandrasiri (Asst. Treasurer)
Koralegedera Pushpakumara
Sarah Kumarasiri (Deputy Chairman)
Nilanthi Weerasekera
Anura Krishantha
Pala Pothupitiya
Kapila Palihawadana
Niranjala Gunasinghe
Thisath Thoradeniya
Prasanna Ranabahu
Sanath Kalubadana