LaSalle Network

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LaSalle Network is a company led by talented, dedicated individuals. Our executive leadership team is committed to placing the best talent and growing our clients' business.


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Tom Gimbel Founder, CEO

Tom at a glance
  • 20 years experience
  • Leadership and oversight
  • Chicago Entrepreneur Hall of Fame
  • Crain's 40 Under 40
  • University of Colorado

Tom Gimbel is the Founder and CEO of LaSalle Network, a professional staffing and recruiting firm headquartered in Chicago with offices in the suburbs, as well as San Francisco. Founded in 1998, LaSalle has served thousands of clients and candidates, placing job seekers in temporary, temporary-to-permanent and permanent positions.

Prior to starting LaSalle Network, Gimbel spent several years in sales and marketing at both national and local service organizations. At 26 years old, Gimbel left his employer to create the first Chicago firm to offer employment solutions to the accounting and finance world. Today, LaSalle Network has four offices and business units including accounting & finance, technology, administrative, call center, human resources, marketing, supply chain, healthcare revenue cycle and executive search.

LaSalle Network has grown organically 15% year over year since inception, landing it on the Inc. list of Fastest Growing Private Companies in America in 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 and 2015. LaSalle was also recognized as one of the Top Five Best Staffing Firms to Work for in America in 2011, 2012, 2013, 2014, and 2015 by Staffing Industry Analysts, chosen as a Best Place to Work in Chicago by Crain’s Chicago Business and Chicago Tribune in 2014 and 2015, named the #1 Best and Brightest Company in Chicago in 2015, and recognized on Glassdoor’s list of Best Places to Work in 2016.  Gimbel was honored on Crain’s Chicago Business 40 Under 40 in 2009 and was inducted in the Chicago Area Entrepreneurship Hall of Fame in 2010.

Gimbel is an expert on organizational development, career management, company culture and hiring and retaining top talent. He regularly contributes to CNBC, Today Show, Entrepreneur, Fortune and Inc.

Gimbel is on the Board of Directors at the Ounce of Prevention and the American Staffing Association. He is also an active member of the Young Presidents’ Organization and Entrepreneurs’ Organization.

Tom holds a BA from the University of Colorado.

For more about Tom, visit

Maureen Hoersten Chief Revenue Officer

Maureen Hoersten Headshot CRO - LaSalle NetworkMaureen at a glance
  • 12 years experience
  • Client development
  • Chicago Business Journal Women of Influence 2016
  • University of Iowa

As Chief Revenue Officer for LaSalle Network, Maureen Hoersten (Brown) is responsible for driving and managing new and existing business, as well as overseeing the recruiting functions for our customer service and office services verticals. She has been instrumental in building LaSalle Network’s client base and sales program. Her role includes creating and executing sales strategies; coaching and training a business development team, as well as a project management team; identifying, attracting and engaging key target clients and cultivating and growing client relationships.

Originally hired as a Business Development Manager in 2003, Maureen was an early leader in developing LaSalle Network’s suburban presence. Growing key clients in the retail, entertainment, business services, food and beverage and healthcare industries, Maureen has placed more than 3,000 job seekers with some of the best small, medium and large sized businesses.

Maureen has an uncommon depth of knowledge in staffing and recruiting having been in the industry since 2003 and working with startups and Fortune 500 companies. She understands individual and organizational goals and concerns to effectively deliver top talent.

In 2016, Maureen was honored as one of the Chicago Business Journal’s Women of Influence.

Maureen has a BA from The University of Iowa.

Sirmara Campbell Twohill Chief Human Resources Officer

Sirmara Campbell Twohill CHRO Headshot - LaSalle NetworkSirmara at a glance
  • 15 years experience
  • Workforce Magazine's Workforce Game Changer 2015
  • Columbia College Chicago
  • PHR

Sirmara Campbell Twohill has over 15 years of experience in the staffing and recruiting industry, starting her career at LaSalle Network shortly after its inception in 1998. Sirmara is an experienced human resources professional whose expertise lies in helping LaSalle Network maintain a healthy and productive company culture. She is also certified as a professional in human resources.

Over the past 15 years, Sirmara has assumed roles in accounting, operations and human resources. Sirmara has been involved in the planning and execution of nearly all LaSalle’s new initiatives in the last 15 years, including most recently, compliance with the Affordable Care Act. Highlights of Sirmara’s accomplishments include a Field Employee benefit plan, a rare and differentiating service in the staffing industry, and creation and implementation of a detailed onboarding program for new hires to ensure a smooth transition into LaSalle Network employment.

In addition to her human resources responsibilities, Sirmara handles all LaSalle Network operations functions, including best practice procedures, in order for LaSalle to operate at a high level of efficiency, quality and professionalism.

Sirmara was recognized by Workforce Magazine as a 2015 Workforce Game Changer.

Sirmara has a BA from Columbia College Chicago.

Lawrence Casas Chief Financial Officer

Lawrence Casas CFO Headshot - LaSalle NetworkLawrence at a glance
  • 16 years experience
  • Finance and Operations
  • University of Illinois

Lawrence is a Certified Public Accountant, with over 16 years of experience in the staffing and recruiting industry.

Prior to joining LaSalle Network, Lawrence owned a practice specializing in part-time controller/CFO services, as well as providing accounting and tax services. Previously, Lawrence was a chief financial officer of a $25 million technology services firm in Chicagoland. Prior to that, Lawrence spent over six years as a controller in the staffing industry.

As the Chief Financial Officer of LaSalle Network, Lawrence oversees all aspects of internal accounting and is responsible for financial management and reporting, process and procedures and financial and business analysis.

Lawrence was recognized with the Daily Hearld’s CFO of the Year in 2013.

Lawrence graduated with a BA from University of Illinois at Urbana-Champaign.

Krisi Rossi Chief Recruiting Officer

Krisi Rossi O'Donnell CRO Headshot - LaSalle NetworkKrisi at a glance
  • 10 years of experience
  • Staffing and recruiting
  • LaSallian of the Year
  • BA from St. Louis University

Krisi Rossi O’Donnell has over ten years of experience in the staffing and recruiting industry, and has placed professionals in technology, accounting, finance and executive leadership positions. As Chief Recruiting Officer, Krisi manages 40+ people across three business units. She is responsible for managing the internal process for identifying, qualifying and placing candidates, as well as helping to strategize the expansion and growth of LaSalle Network.

Krisi started her career at LaSalle in February 2004 as a junior project manager. She has earned numerous internal accolades, and was subsequently promoted to Unit Manager in 2007, Associate Director in 2010, Director in 2012, Managing Director in 2012, Vice President of Staffing and Recruiting in 2013, and Chief Recruiting Officer in 2015.

Krisi has a BA from St. Louis University.