Management Team

Thomas Corbett serves as Executive Chairman of Alliant Insurance Services and previously served as Chairman and Chief Executive Officer for more than 30 years. During his tenure, Corbett has played a central role in Alliant’s growth, guiding the company’s emergence into one of the fastest-growing insurance brokerage and consulting firms in the nation. Upon joining Alliant in 1977 as a producer, Corbett launched the Public Entity Group, building it into one of the nation’s largest public entity insurance programs. Corbett is a graduate of California State University, Long Beach. He is currently involved in various community and charitable organizations.

Greg Zimmer is Chief Executive Officer of Alliant Insurance Services and previously served as President of Alliant, where he was responsible for implementing the strategic direction of the firm, including all mergers and acquisitions activity. Prior to joining Alliant in 1998 as Chief Financial Officer, Zimmer and his partners built a significant financial services firm that ultimately was sold to GMAC, where he served as Senior Vice President. His diverse career background also includes experience in corporate finance and venture capital. Zimmer holds a bachelor’s degree in economics/systems science from the University of California, Los Angeles (UCLA) and a master’s degree from the Anderson Graduate School of Management at UCLA.

Ralph Hurst serves as President of Alliant Insurance Services and was formerly President, National Brokerage, where he led Alliant’s brokerage teams across all business groups. Since joining Alliant in 1987, Hurst has played a central role in the establishment and management of several of the firm’s major programs, including the Public Entity Property Insurance Program (PEPIP), the Hospital All Risk Property Program (HARPP), and the Tribal Property Insurance Program (TPIP). In addition, he directs the company's reinsurance, carrier relations, and risk management functions. Prior to Alliant, Hurst was with the Factory Mutual Group for ten years as a producer. He earned a bachelor’s degree in industrial technology-fire science from California State University, Los Angeles.

As Chief Operating Officer of Alliant Insurance Services, Peter Carpenter is responsible for overseeing all operations of the company. Additionally, he directs Alliant’s mergers and acquisitions activity and leads its hiring strategy, which is dedicated to attracting the industry’s best and highest performing sales professionals. Carpenter has more than 30 years of experience in the insurance industry and joined Alliant in 2008 when it acquired ClearPoint, a Seattle-based employee benefits consulting firm that he co-founded and where he served as CEO. Prior to founding ClearPoint, Carpenter served as Vice President of Sales and Marketing for a large regional insurance brokerage firm and as a group representative for Sun Life Insurance Company. He earned a bachelor’s degree from Colby College in Waterville, ME, where he majored in government and Spanish.

Ilene Anders oversees the company’s finance, accounting, and IT operations. Anders brings a multidisciplinary approach to the position well-suited for an industry where the worlds of finance and technology continue to merge. She previously served as Alliant’s Chief Information Officer, where she created the vision for client-facing technologies, directed business intelligence, and oversaw the integration of systems and infrastructure. Prior to that, Anders was Alliant’s Vice President and Director of Financial Planning and Analysis. She also has experience in investment banking and corporate development with Prudential Volpe Technology Group, GMAC-RFC, and has served as a strategic consultant to start-up organizations. Anders holds a master’s degree in business from San Diego State University and a bachelor’s degree in finance from Boston University.

Peter Arkley is responsible for development and implementation of the Alliant Retail P&C business and financial strategy; which includes Alliant Specialty business for Aviation, Agribusiness, Construction, Environmental, Financial Institutions, Healthcare, Management Liability, Marine and Energy, Mergers and Acquisitions/Transactional Liability, Public Entity and Real Estate operations. Arkley joined Alliant Insurance Services, Inc. in 2011 and brought together the premier construction risk management talent in the United States. Prior to joining Alliant, Arkley served as Chief Executive Officer of the construction operations at Aon, an international insurance brokerage firm. Prior to joining Aon in 1994, Arkley held senior executive positions with Marsh & McLennan and Johnson & Higgins in New York and Los Angeles. He began his career in 1977 with American International Group where his central focus was financial services products such as directors and officers and fiduciary liability insurance. Arkley was named by Insurance Business America as a 2024 Hot 100 industry leader. 

James Crystal has served as a trusted advisor to many of the nation's foremost entrepreneurs, executives, and investors over a career spanning more than 50 years. Most recently, Crystal was Chairman and Chief Executive Officer of Crystal & Company prior to its 2018 acquisition by Alliant. After joining his father, Frank Crystal, in 1961, Crystal was named President in 1963. Under his leadership, Crystal & Company grew far beyond its original roots on Wall Street to serve a global clientele. Crystal serves as a Vice Chairman, Trustee, and Board Member of the Executive and Finance Committees and Co-Chairman of the Audit Committee of Mount Sinai Medical Center, as well as serving on the Boards of Directors of K2 Global Consulting and Ennia Caribe Holding, NV. Crystal has also served on the boards of Global Indemnity, Blockbuster, Stewart & Stevenson, and Donkenny.

James D. Carey is a Senior Principal of Stone Point and a member of the Investment Committees of the Trident Funds. He joined Stone Point in 1997 from Merrill Lynch & Co. Prior to joining Merrill Lynch & Co., Carey was a corporate attorney with Kelley Drye & Warren LLP. Carey is a director of a number of portfolio companies of the Trident Funds, including Alliant Insurance Services, Inc., Citco III Limited, Enstar Group Limited, the holding company of Amherst Pierpont Securities, Oasis Outsourcing Corporation, Privilege Underwriters, Inc., and Sedgwick Claims Management Services, Inc. He holds a B.S. from Boston College, a J.D. from Boston College Law School, and an M.B.A. from the Duke University Fuqua School of Business.

Lilian Vanvieldt is a 30-plus-year insurance industry veteran. As Chief Diversity, Equity & Inclusion Officer (CDEIO), Vanvieldt leads a companywide effort to promote diversity and inclusion within Alliant and throughout the broader insurance industry through a focus on awareness, training, and mentoring. At the heart of this effort is Vanvieldt’s longstanding commitment to expanding opportunities for career growth and advancement for individuals with diverse backgrounds and life experiences. In addition to her role as CDEIO, Vanvieldt is one of the nation’s leading brokers in the education space. She leads the Alliant Kindergarten to Community College (K-14) Public Entity program and plays an influential role in setting the program’s national business strategy. A proud survivor of stage III breast cancer, Vanvieldt currently serves as Director of the Susan G. Komen Leadership Foundation in San Diego and was that organization’s Honorary Breast Cancer Survivor of the Year in 2018. She uses her voice and influence to advocate for equality in access to health services for women of color and is an active spokesperson for breast cancer education and prevention. Vanvieldt holds a bachelor’s degree in economics and history from the University of California, Los Angeles.

Diana Kiehl partners with key executives to broaden sales and service best practices within the company’s numerous specialty groups and practices. In addition, she oversees the company’s corporate risk management and professional development departments. Kiehl also is the executive sponsor for the national philanthropy program and leadership development program. She joined Alliant in 1991 as an associate producer and was promoted to producer in 1993, helping to build such specialty programs as the Owner-Controlled Insurance Program (OCIP) and the Hospital All Risk Property Program (HARPP). Subsequently, she held several management positions with the company, and in 2006 was promoted to Managing Director of Brokerage Services. Kiehl earned a bachelor’s degree from California State University, Long Beach, a master’s degree from Pepperdine University, and attended Wharton’s Management Education Program.

Steve Sampiere is 35-year industry veteran with extensive experience designing and directing a breadth of initiatives to ensure the most innovative, robust, and secure information technology environment possible. As Chief Information Officer, Sampiere focuses on advancing Alliant’s technology strategy and bolstering its security posture while overseeing client-facing technology solutions. Throughout his tenure with Alliant, Sampiere has played a central role in transforming the company’s technology infrastructure amid ongoing significant organizational growth. Under his leadership, complex systems integration, enhanced data security, and standardized best practices have been implemented across Alliant’s national network. Prior to joining Alliant, Sampiere developed a diverse skillset working with firms inside and outside the realm of technology, including IBM, Callaway Golf, Intuit, and Peregrine Systems.

Jennifer Baumann is the head of Alliant’s legal department and has oversight of legal operations for all of Alliant and its subsidiaries. Baumann joined Alliant in 2008 as Assistant General Counsel and later expanded her role to assume responsibilities as the company’s privacy officer. In January 2019, Baumann stepped into her current role and has supported Alliant through a period of tremendous expansion, growing and reorganizing the legal department to align with Alliant’s ongoing growth. Prior to joining Alliant, Baumann practiced as a litigator with San Diego-area employment law defense firms. She holds a law degree from the University of San Diego School of Law and undergraduate degrees in English and comparative literature and Spanish linguistics from the University of California, Irvine.

As the top human resources executive at Alliant, Jennifer Martin is responsible for the design and direction of all human resources functions within the company. With 30 years of HR experience, she oversees a 50+ member HR department that supports all of Alliant and its employees. Martin joined Alliant in 2004 and was instrumental in transforming the company’s HR department into a proactive business solutions environment. In this role, Martin has led the HR integration of 70+ acquisitions as the company has grown into one of the nation’s largest insurance brokerage and consulting firms. Martin’s prior experience includes HR leadership roles in the technology, architectural, and engineering industries, and she was recognized in 2016 with a top spot on HR Executive Magazine’s HR Honor Roll. Martin attended the University of Texas at Austin and has a bachelor’s degree in business management, as well as an MBA from California State University, Fullerton. She holds the Senior Professional in Human Resources (SPHR®) certification.

Aileen Morris oversees Alliant Corporate Marketing and Communications. She brings an array of expertise in corporate strategic marketing, PR, internal communications, business strategy, and brand management roles from in-house and agency experience, providing her with a true 360-degree view of modern communications challenges. Morris joined Alliant in 2015 as Director of Marketing for the Employee Benefits group, which gave her a strong foundation of Alliant relationships and knowledge upon which to build. Before Alliant, Morris gained significant communications experience at Premera Blue Cross, where she led the creation of healthcare benefits communications for Microsoft, Alaska Airlines, Amazon, and Starbucks. She also led extensive GTM planning, messaging, and marketing strategy for a premier technology marketing consultancy company’s flagship account, Microsoft. Morris holds a business degree from the University of Washington – Michael G. Foster School of Business.

Sean McConlogue has more than 20 years of experience in the insurance industry, with particular emphasis on specialty program development. Before joining the company in 2003, McConlogue served as President of Affinity Insurance Services, LLC, and prior to that held senior-level management positions with Tristar Insurance Services, Arthur J. Gallagher & Co., and Xerox Corporation. McConlogue earned a bachelor’s degree in economics from the University of California, San Diego and a master’s degree in international management from Thunderbird, The American Graduate School of International Management.

Kevin Overbey directs the ongoing growth and expansion of the national division. Since 2010, Overbey’s leadership in Alliant’s collaborative culture has cultivated the division’s remarkable growth from $100M to $600M while expanding its footprint to serve local regions across the nation. With 30 years in the employee benefit services industry and experience with a wide span of both domestic and international clients, Overbey leads the division with a compelling vision in pursuit of healthcare delivery transformation through data-driven value and efficiency. This vision propels Alliant’s teams to help employers drive innovation and service while engaging their people to drive sustainable outcomes. Prior to joining Alliant, Overbey was a founding and managing partner of ClearPoint (acquired by Alliant in 2008), an employee benefits consulting and brokerage firm, and one of the largest privately held insurance brokers in the Pacific Northwest. Overbey is a graduate of Oregon State University.

Michael Cusack is one of the leading executives within the surety and construction insurance industry in the United States. His 30 years of experience include extensive background in underwriting, account leadership, and brokering of some of the largest and most complex surety programs in the nation. Cusack played a pivotal role in the formation of the construction operations for Alliant Insurance Services. He joined Alliant in 2011 and helped create what is now the largest construction brokerage organization in the country. Given the track record of attracting and developing industry-leading broker talent, Cusack was named the Co-Chief Operating Officer of Alliant Specialty Group. Alliant Specialty has flourished through the global pandemic, and in 2022 Cusack was named the Senior Managing Director to lead Alliant Specialty. In this role, he is responsible for expanding Alliant’s $800M specialty business across the United States. Prior to joining Alliant, Cusack was a Managing Director, Contract Surety practice leader, and Executive Committee member within Aon Risk Services’ construction unit. Prior to this experience, Cusack worked with Willis as a surety broker and initiated his career as a contract surety underwriter with Seaboard Surety.

Bob Bennetsen heads Alliant’s dedicated regional retail P&C platform providing targeted insurance, risk management, and consulting services to midsized businesses throughout the United States. Bennetsen has a diverse insurance background that spans both the carrier and brokerage sides of the business. He previously served as Executive Vice President and Managing Director of Alliant Employee Benefits, overseeing its Northeast operations. Prior to joining Alliant, Bennetsen held leadership positions directing sales and account management activities for two of the nation’s largest healthcare providers. He earned a bachelor’s degree in economics from Central Washington University.

James R. Matthews is a Principal of Stone Point. He joined Stone Point in 2011 from Evercore Partners, where he was a Senior Managing Director and Co-Head of Private Equity. Previously, Matthews was with Welsh, Carson, Anderson & Stowe, where he was a General Partner and focused on investments in the information services and business services sectors, and a General Partner of J.H. Whitney & Co. He started his career as an Analyst in the mergers and acquisitions group of Salomon Brothers Inc. Matthews is a director of Black Mountain Systems, LLC, Eagle Point Credit Company Inc., Eagle Point Credit Management LLC, Enhanced Capital Holdings, Inc., NEBCO Insurance Services, LLC, and Tree Line Capital Partners. In addition, he is a board member of Frenkel & Company and he is a former director of Bollinger, Inc., Fidelity Sedgwick Holdings, Inc., Ruesch International Inc. and Headstrong Inc. He holds a B.S. from Boston College and an M.B.A. from the Harvard Graduate School of Business Administration.

Ziv Ehrenfeld is a Managing Director in the Private Equity team in New York, heading Strategy and Active Management globally. He serves on the boards of several private equity portfolio companies as well as on the board of D-Wave (NYSE: QBTS). He joined PSP Investments USA in August 2015 to develop Private Debt as a new asset class. Ehrenfeld’s primary focus included business development, tax planning, building the team and overseeing operations, as well as leading commitments in more than $5 billion of direct and fund investments. He also served as a member of the firm’s global investment committee.

Prior to joining PSP Investments USA, Ehrenfeld was a Director in Leveraged Finance at Barclays. He started his career practicing law with the Fischer Behar Chen Well Orion & Co. law firm. Ehrenfeld holds an LL.B. Bachelor of Laws and a BA in Economics from Tel Aviv University and an MBA from Wharton.