Prior to founding The Koltun Group in 2012, Marion was the Chief Operating and Development Officer at the Foundation for Jewish Culture, after serving as National Director of Major Gifts at the Jewish Theological Seminary's William Davidson Graduate School of Jewish Education.
Marion served as Executive Director of Dance Theater Workshop (DTW, now New York Live Arts) where she joined the staff in June of 1999 to strategically plan and execute its $14 million capital campaign including building the Doris Duke Performance Center and establishing DTW's first endowment. She was appointed Executive Director in July 2003 and served until 2007. During her tenure, she was responsible for all aspects of institutional stabilization in partnership with DTW's 43-member Board of Directors.
From 1996 to 1998, Marion served as Executive Director of Congregation B’nai Jeshurun, where she supervised all aspects of the organization’s $4 million operating budget.
From 1991 to 1996, as General Manager and Director of Operations at the New 42nd Street, Inc., Marion was part of the senior management team which oversaw and implemented the organization’s evolution to a fully active landlord/operator of four commercial properties and two non-profit theaters on the now-celebrated 42nd Street in Times Square. Marion was instrumental in the creation of the New Victory Theater, New York's premiere theater for young people.
Marion has also served as General Manager of the New York Dance Center from 1987 to 1990, Managing Director of Mabou Mines from 1986–1987, and Administrator for Lloyd Richards and the O’Neill Theater Center’s National Playwrights Conference from 1983- ‘86 .
Her teaching credits include theater management seminars at the Yale School of Drama (MFA '83) for over 15 years, and Vassar College (BA '77). Marion begins teaching a graduate online course in Fundraising at Winthrop University in 2020. She received a Graduate Certificate in Executive Education, Leadership-Arts Business School from Stanford University in 2004. Dienstag has guest lectured and appeared on numerous panels in the arts and real estate development.
Marion most recently served as Board President for the Bronx Academy of Arts and Dance.
Alvin Ailey Dance Foundation
Batsheva Dance Company
Double Edge Theater
Independent Media Arts Preservation
The 52nd Street Project
The Fisher Center for the Performing Arts at Bard College
Emmett Global Tech
Nimbus Dance Works
The Norton Museum
Stephen Petronio Company
Westport Country Playhouse