Executive Bios


Jonathan Ullman is Executive Director & CEO of The Mob Museum, the National Museum of Organized Crime and Law Enforcement. The Mob Museum is a 501(c)3 nonprofit located in downtown Las Vegas, with a mission of advancing the public understanding of organized crime’s history and impact on American society.  Reporting to a 20-member Board of Directors, Jonathan is responsible for leading the organization that has been named both a “Top Workplace” and “Best Museum” by the Las Vegas Review Journal and being named one of USA Today’s “12 Can’t Miss U.S. Museum Exhibits.”Jonathan has spent over 20 years in a variety of management and leadership roles within the nonprofit industry. Jonathan’s museum career began at Liberty Science Center, New Jersey’s most visited museum, where he was intimately involved in the strategic planning and operationalizing of the facility following a $109 million capital expansion. Over the years, Jonathan served in numerous capacities with responsibilities including intensive staff management, program oversight, and external relations. Immediately prior to joining The Mob Museum, Jonathan was the president and COO at the National Soccer Hall of Fame, where he led the dramatic transformation of the organization’s operating model.

Jonathan earned his Bachelor’s Degree from Rutgers College and his Masters of Business Administration from Rutgers Business School. A believer in the importance of community, Jonathan has volunteered on a number of nonprofit boards and community-driven initiatives. Jonathan currently serves as Vice President of the Downtown Las Vegas Alliance. He is a graduating member of the LV Metro Police Department Citizens’ Academy and the FBI Citizens’ Academy, now serving on the Board of the FBI Citizen’s Academy Alumni Association. Additionally, Jonathan is a graduate of the Las Vegas Metro Chamber of Commerce’s Leadership Las Vegas program and the immediate past-Curriculum Chair. Jonathan resides in Las Vegas with his wife and three children.


Mark B. Achenbach is responsible for The Mob Museum’s Human Resources and Finance functions and provides oversight to the accounting and technology departments. He is an attorney, licensed in Nevada, New Jersey and New York. Prior to joining The Mob Museum, Achenbach managed a solo-practice law firm in northern New Jersey. He earned his JD from the Rutgers School of Law – Newark, and his BS from West Virginia University. Before entering law school, Achenbach’s concentration was on the human resources field, principally in the nonprofit sector, including a 4-year tenure at Liberty Science Center.


Golda Cordowin brings a great depth of knowledge and experience in guest services, operations, leadership development and training to her position at The Mob Museum. In her most recent role she has been with resort and gaming properties including the Palms Casino Resort, Caesars Entertainment, Excalibur and Luxor Hotels. Prior to coming to Las Vegas, Golda’s early career was spent in a variety of roles at The Disneyland Resort including positions in the Disney University and Community Relations.


Michael A. Dagenais is responsible for the cross-departmental collaboration that ensures continuous improvements in all aspects of the guest experience at The Mob Museum. In this capacity, Dagenais has direct oversight of all staff members who operate the public spaces, including the box office and exhibit floors. Prior to joining The Mob Museum, Dagenais served as guest services manager for the Springs Preserve in Las Vegas where he was a part of the team that built and opened the Preserve. He was also assistant general manager for Rawhide Western Town in Scottsdale, AZ; director of operations for Wet ‘n Wild Water Park in Las Vegas and director of operations for Sea World in San Diego, CA. Dagenais has a Master of Arts with emphasis on museum studies and a Bachelor of Arts in economics from the University of California, San Diego.


Kimberly Kindig is responsible for the cultivation of memberships and sponsorships, development of donor opportunities, and formation of effective relationships that enhance the organization’s standing in the community and its overall financial growth. As the former Executive Director for the Solutions Foundation and Director of Senior Programs for Catholic Charities, Kimberly, a Las Vegas native, has a robust background in resource development and fundraising within the non-profit sector. She received her Master’s degree in Nonprofit/NGO Leadership from the University of Pennsylvania and her Bachelor’s degree in Political Science from Vanderbilt University.


Ashley Miller is responsible for  developing and implementing marketing strategies, digital initiatives, promotions, sales and research for the Museum. Most recently, she worked as director of communications for a real estate investment start-up focused on alternative financing and merchandising mixes authentic to the local area. Previously, she was responsible for public relations and marketing for Loews Hotels, a luxury hospitality company that operates 26 hotels in the U.S. and Canada. Ashley earned her Bachelor’s Degree in Communications with a minor in advertising and public relations from the University of Nevada, Las Vegas and her Masters of Business Administration from Keller Graduate School. An active alumni of UNLV, she is a member of the Events Executive Committee as well as Vice President of the Greenspun College of Urban Affairs Alumni Association.


After a 25-year career in journalism, Geoff Schumacher is the director of content for The Mob Museum in Las Vegas. A graduate of the University of Nevada, Reno, Schumacher started his career at the Las Vegas Sun, where he was a reporter, editorial writer and city editor over a 10-year period. He was editor of Las Vegas CityLife and founded and edited the Las Vegas Mercury. He served as director of community publications for the Las Vegas Review-Journal for 10 years and also wrote a weekly public affairs column for the Review-Journal. He culminated his newspaper career by serving as publisher of the Ames (Iowa) Tribune. Schumacher is the author of two books, Sun, Sin & Suburbia: A History of Modern Las Vegas and Howard Hughes: Power, Paranoia & Palace Intrigue. He served as editor of Nevada: 150 Years in the Silver State, the official book commemorating the state’s sesquicentennial.


Sabine von Henning is responsible for the planning of special events and facility rentals as well as group ticket sales. A native of Berlin, Germany, Sabine has many years of sales and event management experience in the international tourism industry. She earned a degree in hospitality management and a degree in commercial law with a concentration in sales and marketing. Before making Las Vegas her home she lived and worked in various European and North African countries as well as the Caribbean adding Spanish, French and Italian to her native German language. Most recently, she worked as director of sales and marketing for a local destination management company.