1972
MarkO left the University of California on a scholarship program to University in Sweden. During that year in Sweden, he started his import and export business of Jewelry and Textiles.
1975
He moved to the Himalayas and he began to document, collect and promote the unique culture and textile arts of Bhutan.
1976
He began consulting with the Royal Government Ministers of Bhutan and numerous Royal family members about preserving and perpetuating their unique culture and art heritage.
1978
He held his debut exhibition on Bhutanese traditional textiles and published an accompanying catalog for the Museum for Textiles in Toronto, Canada.
1979
He started his VIP exclusive travel company called Druk Quest leading high-end tours to Thailand, Nepal, India, and Bhutan. He was given permission by the Royal Government to lead exclusive tours into Bhutan which were some of the first Western tourists ever allowed into Bhutan in its entire history.
1982
MarkO moved to Tokyo, Japan to begin publishing his book on Bhutan art and culture.
1985
He published his first book, Thunder Dragon Textiles from Bhutan, Shikosha. Publishers, Kyoto, Japan in both English and Japanese. This was the first major publication in the world highlighting Bhutanese culture and textile art heritage.
1985
MarkO held his first major international exhibition at the Seibu Art Gallary, Tokyo Japan, featuring a significant part of his collection.
1986 - 97
He moved to Central America establishing a base in the Yucatan to study the cross-cultural similarities of the culture and textile arts of Bhutan and the Yucatan.
1987
MarkO established the Bhutan Culture Preservation Foundation (later to become the GreenHeart Foundation), a charitable non-profit Foundation for showcasing to the world Bhutan’s Unique traditional heritage.
1993
After years of studying the Mayan culture and their unique calendar, he had a breakthrough and then published a revised version of the most widely used and esoteric Mayan calendar called “Zolkin”.
1998
MarkO moved to Laos to continue his Buddhist and Asian cross-cultural studies and collaborated with the Lao government and numerous NGOs (Non-Government Organization) to preserve and perpetuate traditional Lao culture and the present-day well-being of Lao Villages.
1999
Honorable Foreign Minister, Lyonpo Jigme Thinley, extended to MarkO his fourth Royal Government Invitation by a Minister of Bhutan.
2000-2010
Continued collaborating and consulting with Lao Government agencies and international NGOs.
2009
Bhutan`s Royal Government stated in a letter their recognition of the importance and sole propriety rights of ownership of the Bartholomew Collection of Sacred Bhutan Art and Textiles
2012
MarkO moved from Laos and relocated back to the United States with his three daughters.
2013
He established the GreenHeart Foundation in California as a non-profit humanitarian organization.
2015
MarkO moved with his family to Oxford, England to expand the reach of his Foundation and began consulting with universities and Museums around the United Kingdom.
2016
He moved to Bali, Indonesia with his family to introduce his GreenHeart Foundation. He became a consultant to high Government officials introducing concepts of Eco-Culture tourism and traditional culture preservation.
2018
MarkO and his family moved to Hawaii, USA to study the traditional Hawaiian culture with hopes of integrating vital aspects of the GreenHeart Foundation to collaborate with government officials and the Hawaiian Community.
2022
He is relocating the GreenHeart Foundation to Hawaii. The new mission and goals are to Preserve, Perpetuate and Promote traditional art and culture in “PolynAsia” (From Polynesia extending to Central Asia).