About Us


eGo CarShare was started by a group of Boulder citizens who were very concerned about minimizing their environmental impact, and who strived to leave a more sustainable legacy for future generations. They took the issue of transportation to heart and made a commitment to minimize their automobile use. In 1997, the “Little Red Car Co-op” was formed. The momentum continued forward, and in 1998, Boulder CarShare (BCS) was founded.

The organization was incorporated as a Colorado nonprofit on August 28, 1998. Approval by the IRS as a 501(c)(3) entity came on April 3, 2006. Boulder CarShare rebranded in January 2009 as eGo CarShare in order to bring its service to the city of Denver. In March of 2009 eGo CarShare placed its first three cars in Denver, and in the fall of 2009 eGo CarShare received its first significant outside funding from a CMAQ (Congestion Mitigation and Air Quality) grant to aid in its expansion to core Denver neighborhoods.

Since then we have been adding new locations through partnerships and another round of CMAQ funding, which has allowed us to start adding carshare vehicles in close proximity to B-cycle (Denver & Boulder’s bike sharing systems) stations to create multimodal hubs. These hubs allow members to “right size” their transportation. They can choose to walk, bicycle, B-cycle, jump on the bus or light rail, or grab a carshare car depending on their need.

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Core Staff

We couldn’t do what we do as a small community nonprofit without stellar staff members. Lucky us that we have found the best of the best to assist our members at all times of the day, keep our fleet running smooth, and lead our organization to the next level. Find out more about these hardworking folks!

Karen Worminghaus – Executive Director

Karen has been eGo CarShare’s (formerly Boulder CarShare’s) tireless Executive Director since the program’s inception in 2001, and, not coincidentally, she has also been car-free for over 14 years. Karen grew up in the Midwest, but the Rocky Mountains lured her out to Colorado in 1997. Once she discovered she could easily and joyfully get nearly everywhere in Boulder by bike and bus, she was here to stay. What started out as a volunteer and “hobby” project for Karen has gradually transformed into a thriving, non-profit carsharing program – one of the first of its kind in the nation (as evidenced by our URL carshare.org). From 2001-2010, Karen volunteered her time as ED. During those early years for her “day job” she worked in the LOHAS industry, was the CFO of a local home health care agency, and the Conference Manager for Sustainable Resources (a Boulder NPO). Eventually, though, carsharing took over her life, and it’s not just a hobby anymore. She is passionate about helping to transform the way we think about transportation, and advocates for placing people, rather than cars, at the heart of community planning, so that we can create more sustainable, fulfilling and inspirational communities. Karen holds a BA in physics from DePauw University and a teaching certification from UW-Stevens Point.  

Favorite Member Interaction: There are so many, it's hard to pick just one. All of our members rock! Any person who chooses to live car-lite or car-free inspires me. But here’s an example of how much our members look out for each other: a member left a personal credit card in one of our cars. The next member found it and left us a message about it. When we called her back later that day to arrange to get the credit card back to its rightful owner, she informed us that she had already taken it upon herself to find the credit card owner on Facebook, and she had already returned the card to him. I love it when people help each other out like that.

Lauren Barnard – Billing Manager

Lauren has her degree in Technical Management, with a concentration in Accounting. Lauren previously assisted people in a career as a physical therapist but for the past five years has switched over to helping people by sorting out their billing issues. She comes to us by way of the Brewing Market and numerous other clients whom she has helped get their finances in order. Lauren is an avid biker, snowboarder, and also enjoys horseback riding.

Brian Crawford – Fleet Manager

Brian Crawford came to us in November of 2015. He previously worked for Real Good Solar Energy and brings with him a passion for sustainability. Brian is an avid bike rider and has been car-free for over 5 years. He enjoys getting outdoors, backpacking, and brewing beer.

Jim Chappell – Fleet Assistant

Board of Directors

Staff could not propel eGo to the next level without the oversight and leadership of our dedicated Board of Directors.

Zac Swank – President

Zac Swank has experience starting, running, and consulting with a wide variety of businesses. He is currently a business sustainability team lead at Boulder County’s Partners for a Clean Environment program, where he advises local businesses on environmental sustainability practices. Previously he was operations manager of the nonprofit carsharing organization, eGo CarShare, where he oversaw 25% growth in two years. Prior to that, he worked as a fellow at Natural Capitalism Solutions, where he helped a $1.8 billion restaurant chain establish its first sustainability program. Zac has also orchestrated the business plan, construction, and management training for a sustainable tourist lodge. He holds a master’s in business administration and a bachelor’s in environmental politics.

Daniel Ziskin – Vice President

Daniel Ziskin grew up in a car-dependent sprawling suburb of Philadelphia. In 1993 he received a Ph.D. in physics from The Johns Hopkins University by studying clouds and their effect on climate. After his ultimate frisbee career peaked, he became involved as a transportation activist fighting the construction of a wasteful outer beltway around Washington, D.C. In 1998, Daniel moved to Boulder. He donated his car to eGo CarShare and joined the board around 2001.

Greg Ekrem – Treasurer

Greg Ekrem was elected to the board of eGo Carshare in December of 2011 and currently serves as the organization's treasurer. Greg is a Boulder native and is a managing consultant with Navigant Consulting in Boulder. He works within the Energy Practice of Navigant in the Energy Efficiency Group. The focus of his work includes: program lead of impact and process evaluation activities of utility demand response programs, coordination, support and implementation of field activities, market research activities, GIS analysis, database management, and map design. He holds a B.A. in Environmental Conservation, a blended program of geography, biology, and economics from the University of Colorado (CU) at Boulder. An avid walker, Greg has not driven to work in five years and is perennially in the top 20 users of the Boulder B-Cycle bike sharing system.  

Holly Ludwig

Holly has been an eGo Board Member since 2015 and has served as Secretary of the Board since March of 2016.  Holly is a long-time eGo member, joining the organization in 2010.  She lives in downtown Denver and has not owned a vehicle for six years.  Joining eGo CarShare gave Holly the confidence to sell her vehicle and never look back.  Holly enjoys serving on eGo’s Board because she values our mission of reducing the number of cars on the road and finding creative ways to encourage people to minimize or eliminate use of their personal vehicles. Holly is an attorney at Lewis Roca Rothgerber Christie LLP.

Cathy Bird

Originally from Ohio, Cathy fell in love with the freedom of transit at age 11. Stemming from days spent busing to her grandparents, biking on Indiana University's campus, and then guiding students through the Paris metro, Cathy grew into quite the transit geek. In fact, she and her husband searched for a first home in the hub of transit: they live at the intersection of two bus lines, can access four highway on-ramps, and can walk a half-block to a Light Rail station! Moving to Denver in 1991, Cathy taught French and Spanish to middle school students for more than a decade. Switching gears in 2014 brought her to the Citizens' Academy class at the Transit Alliance and an internship at the Alliance Center, all while volunteering at Transportation Solutions, Denver B-cycle, and Safe Routes to School Coalition. Finally in 2016, she was asked to serve on the board of eGo CarShare and became Outreach Coordinator for 36 Commuting Solutions in Louisville.

Chelsea Castellano

Lissa Myers

Thomas Wells

Advisory Board

Annie Bourdon – CarShare Vermont

John Marcil – Faegre Baker Daniels

Aaron Miripol – Urban Land Conservancy


Financial Information

Our most recent 990 filings can be accessed at www.guidestar.org under the name “Boulder CarShare.”