Executive Bios


Jonathan Ullman is President & 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 society. Reporting to a 22-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 ranked #20 on TripAdvisor’s list of top museums in the United States.

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 Chairperson 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 as the President of the FBI Citizens’ Academy Alumni Association.  Additionally, Jonathan is a graduate of the Las Vegas Metro Chamber of Commerce’s Leadership Las Vegas program and a 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.


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.


Felicia Lindquist 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, Felicia has direct oversight of all staff members who operate the public spaces, including the box office, mediated experiences, and exhibit floors. Prior to joining The Mob Museum, she held various operational roles with Four Seasons, Bellagio, and First Service Residential. Felicia received her Bachelor of Arts in history from UNLV and her Master of Arts in history from James Madison University. She is also a member of Leadership Las Vegas, class of 2019.


Araxie earned both her Bachelor’s and Master’s degrees in Accounting from UNLV. She started her professional career in 2004 at the Las Vegas office of PricewaterhouseCoopers, LLP. Araxie received her Nevada Certified Public Accountant License in 2007, passing all parts in the first sitting and ranking #2 in the state of Nevada for that year. That same year she joined Las Vegas Sands Corporation as Financial Operations Supervisor. She was later promoted to the positions of Shared Services Manager and Assistant Controller of Shared Services. In 2014, she joined the Arena Football League (“AFL”) as their Chief Financial Officer. Araxie has a strong commitment to the local community. She has served as Treasurer on the Board of Dress for Success Southern Nevada, and been actively involved with Big Brothers and Big Sisters of Southern Nevada.


Ashley Miller is responsible for  developing and implementing PR & marketing strategies, digital initiatives, partnerships, 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 Masters of Business Administration, and her Bachelor’s Degree in Communications Studies with a focus in advertising and journalism and media from the University of Nevada, Las Vegas. An active alumni of UNLV, she is Vice President of the Greenspun College of Urban Affairs Alumni Association.


Ryan Markus manages all aspects of the Museum’s interactive exhibits, technical infrastructure and computer systems, software and security. He has been with the Museum since its opening in 2011. He continually implements technical advances to enhance guest experience and company productivity.


As the senior director of content, Geoff Schumacher is responsible for exhibits, artifacts and public programs. Schumacher earned his bachelor’s degree in journalism from the University of Nevada, Reno, and his master’s degree in history from Arizona State University. He started his 25-year journalism career at the Las Vegas Sun, where he was a reporter, editorial writer and city editor. He was the 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.


With over 14 years in the food and beverage industry, Clint brings a wealth of knowledge and experience to the team. Most recently he worked as a Mixologist for Alder and Birch Steakhouse at the Orleans Casino. Prior to that he owned and operated Buddha Belly Deli and served as the Beverage Manager for Wolfgang Puck Fine Dining Group. He earned his Associate’s Degree in Culinary Arts from College of Southern Nevada and is a Certified Sommelier.


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.