Headquarters:
Irvine, CA
Year founded:
1925
Number of employees:
14,000+
Phone:
615 324 1199
Email:
alliant-ins@alliant.com
Website:
alliant.com
LinkedIn:
linkedin.com/company/alliant-insurance-services
“Our leadership philosophy is based on the belief that great leaders don’t need to be micromanaged. We work to identify visionary leaders and work alongside them as a team to help them achieve their goals”
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ALLIANT INSURANCE SERVICES
Thomas W. Corbett
Executive Chairman
Greg Zimmer
Chief Executive Officer
Ralph Hurst
President
Leadership
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.
Executive Chairman
Thomas W. Corbett
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.
Chief Executive Officer
Greg Zimmer
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 establishing and managing 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).
Prior to Alliant, Hurst was with the Factory Mutual Group for 10 years as a producer. He earned a bachelor’s degree in industrial technology-fire science from California State University, Los Angeles.
President
Ralph Hurst
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“Our leadership philosophy is based on the belief that great leaders don’t need to be micromanaged. We work to identify visionary leaders and work alongside them as a team to help them achieve their goals”
GREg Zimmer,
Alliant insurance services
“We also use our formidable size and reach as an advantage to drive a better deal for our clients, even in highly competitive markets”
GREg Zimmer,
Alliant insurance services
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“We also use our formidable size and reach as an advantage to drive
a better deal for our clients, even in highly
competitive markets”
Greg Zimmer,
Alliant Insurance Services
“Our leadership philosophy is based on the belief that great leaders don’t need to be micromanaged. We work to identify visionary leaders and work alongside them as a team to help them achieve their goals”
Greg Zimmer,
Alliant Insurance Services
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Peter Carpenter
Chief Operating Officer
In his role as chief operating officer, Peter Carpenter is responsible for managing all day-to-day aspects of the company’s operations and directing its leveraged hire strategy, which is dedicated to attracting the industry’s best and highest-performing sales professionals. He has more than 25 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, he 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.
Chief Operating Officer
Peter Carpenter
Ilene Anders
Chief Financial Officer
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.
Chief Financial Officer
Ilene Anders
“We also use our formidable size and reach as an advantage to drive a better deal for our clients, even in highly competitive markets”
GREg Zimmer,
Alliant insurance services
Peter Arkley
President, National Brokerage
Sean McConlogue
President, Alliant Underwriting and Consumer Solutions
Sophie Cresswell
Head of Marketing
Sarah M Stewart
Associate Vice President,
Leasing and Call Centre Operations
Peter Arkley is responsible for development and implementation of Alliant’s Retail P&C and Employee Benefits business and financial strategy. Retail P&C 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 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, he 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. In 2024, Insurance Business America named Arkley as a Hot 100 industry leader.
President, National Brokerage
Peter Arkley
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, 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.
President, Alliant Underwriting and Consumer Solutions
Sean McConlogue
Sophie Cresswell joined DUAL in 2019 and was appointed head of marketing in 2023. Her responsibilities include marketing strategy, brand awareness, events, content and communications. Before joining DUAL, she held a number of marketing roles in various law firms and start-ups.
Head of Marketing
Sophie Cresswell
Sarah M Stewart has more than 15 years of strategic leasing and customer care experience in residential property management. She is responsible for overseeing all aspects of Centurion’s national leasing platforms, residential lead generation, and overall customer experience excellence through operation of the company’s internal customer service department.
Associate Vice President, Leasing and Call Centre Operations
Sarah M Stewart
Peter Arkley is responsible for development and implementation of Alliant’s Retail P&C and Employee Benefits business and financial strategy. Retail P&C 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 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, he 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. In 2024, Insurance Business America named Arkley as a Hot 100 industry leader.
President, National Brokerage
Peter Arkley
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, 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.
President, Alliant Underwriting and Consumer Solutions
Sean McConlogue
Sophie Cresswell joined DUAL in 2019 and was appointed head of marketing in 2023. Her responsibilities include marketing strategy, brand awareness, events, content and communications. Before joining DUAL, she held a number of marketing roles in various law firms and start-ups.
Head of Marketing
Sophie Cresswell
Sarah M Stewart has more than 15 years of strategic leasing and customer care experience in residential property management. She is responsible for overseeing all aspects of Centurion’s national leasing platforms, residential lead generation, and overall customer experience excellence through operation of the company’s internal customer service department.
Associate Vice President, Leasing and
Call Centre Operations
Sarah M Stewart
Peter Arkley
President, National Brokerage
Sophie Cresswell
Head of Marketing
Sean McConlogue
President, Alliant Underwriting and Consumer Solutions
Anthony Dippolito
Chief Wellness Officer
Peter Arkley is responsible for development and implementation of Alliant’s Retail P&C and Employee Benefits business and financial strategy. Retail P&C 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 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, he 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. In 2024, Insurance Business America named Arkley as a Hot 100 industry leader.
President, National Brokerage
Peter Arkley
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, 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.
President, Alliant Underwriting and Consumer Solutions
Sean McConlogue
Sophie Cresswell joined DUAL in 2019 and was appointed head of marketing in 2023. Her responsibilities include marketing strategy, brand awareness, events, content and communications. Before joining DUAL, she held a number of marketing roles in various law firms and start-ups.
Head of Marketing
Sophie Cresswell
Sarah M Stewart has more than 15 years
of strategic leasing and customer care experience in residential property management. She is responsible for overseeing all aspects of Centurion’s national leasing platforms, residential lead generation, and overall customer experience excellence through operation
of the company’s internal customer
service department.
Associate Vice President,
Leasing and Call Centre Operations
Sarah M Stewart
Read on
Sarah M Stewart
Associate Vice President, Leasing and Call Centre Operations
Sophie Cresswell
Head of Marketing
Sean McConlogue
President, Alliant Underwriting
and Consumer Solutions
Peter Arkley
President, National Brokerage
Ilene Anders
Chief Financial Officer
Peter Carpenter
Chief Operating Officer
Ralph Hurst
President
Greg Zimmer
Chief Executive Officer
Thomas W. Corbett
Executive Chairman
Alliant Insurance Services has carved out a distinctive growth trajectory, powered not by bureaucracy or branding, but by people.
The firm has become one of the most dynamic forces in the industry, charting a path of consistent expansion rooted in strategic selectivity and an unrelenting focus on talent.
It has grown to become one of the largest insurance brokerages nationwide with a culture that eliminates silos, whilst enabling teamwork and entrepreneurialism to thrive.
Alliant champions a decentralised operating model, where top-tier professionals are not merely employees, but equity-holding partners with the autonomy to shape the business. That ethos—of ownership, empowerment and operational freedom—has become central to Alliant’s appeal in a competitive talent market.
“Our leadership philosophy is based on the belief that great leaders don’t need to be micromanaged,” says CEO Greg Zimmer. “We work to identify visionary leaders and work alongside them as a team to help them achieve their goals.”
The formula has proved powerful. Alliant’s ranks have swelled with experienced brokers and practice leaders drawn from competitors, many of whom cite cultural rigidity and diminished autonomy elsewhere as motivators for their move.
“High performers naturally gravitate toward environments where they can excel, so we’ve built a culture that not only attracts top talent but also equips them with the tools, support, and freedom they need to reach their goals,” says Zimmer.
GREg Zimmer,
Alliant insurance services
The firm’s rise has also been underpinned by disciplined organic expansion, with a sharp focus on vertical market development. This has enabled the firm to strengthen client relationships and elevate service standards even as they scale.
Strategic acquisitions, while not the defining feature of Alliant’s growth story, remain a core component of its expansion. The company targets firms that augment its capabilities, bring differentiated expertise, or open new markets, rather than simply adding revenue. Every acquisition is also measured on cultural alignment and the potential for mutual uplift.
Zimmer says, “Our approach to growth is both strategic and deliberate.”
Alliant’s leadership team embrace a philosophy of stewardship over control. The firm encourages collaborative leadership and measured risk-taking.
That resonates with clients as Alliant’s ability to negotiate advantageous terms, often leveraging its scale behind the scenes, has translated into pricing advantages and service flexibility. Clients report higher satisfaction, faster response times, and more proactive risk management—all hallmarks of an empowered team.
The firm’s rise has also been underpinned by disciplined organic expansion, with a sharp focus on vertical market development. This has enabled the firm to strengthen client relationships and elevate service standards even as they scale.
Strategic acquisitions, while not the defining feature of Alliant’s growth story, remain a core component of its expansion. The company targets firms that augment its capabilities, bring differentiated expertise, or open new markets, rather than simply adding revenue. Every acquisition is also measured on cultural alignment and the potential for mutual uplift.
Zimmer says, “Our approach to growth is both strategic and deliberate.”
Alliant’s leadership team embrace a philosophy of stewardship over control. The firm encourages collaborative leadership and measured risk-taking.
That resonates with clients as Alliant’s ability to negotiate advantageous terms, often leveraging its scale behind the scenes, has translated into pricing advantages and service flexibility. Clients report higher satisfaction, faster response times, and more proactive risk management—all hallmarks of an empowered team.
The firm’s rise has also been underpinned by disciplined organic expansion, with a sharp focus on vertical market development. This has enabled the firm to strengthen client relationships and elevate service standards even as they scale.
Strategic acquisitions, while not the defining feature of Alliant’s growth story, remain a core component of its expansion. The company targets firms that augment its capabilities, bring differentiated expertise, or open new markets, rather than simply adding revenue. Every acquisition is also measured on cultural alignment and the potential for mutual uplift.
Zimmer says, “Our approach to growth is both strategic and deliberate.”
Alliant’s leadership team embrace a philosophy of stewardship over control. The firm encourages collaborative leadership and measured risk-taking.
That resonates with clients as Alliant’s ability to negotiate advantageous terms, often leveraging its scale behind the scenes, has translated into pricing advantages and service flexibility. Clients report higher satisfaction, faster response times, and more proactive risk management—all hallmarks of an empowered team.
“We also use our formidable size and reach as an advantage to drive a better deal for our clients, even in highly competitive markets,” says Zimmer.
In an industry grappling with commoditisation and margin pressure, Alliant puts people over process and growth over grandeur. The result is a company built around enduring value - for clients, employees, and the business alike – which continues to be growth focused.
Zimmer adds, “We remain confident in our core business plan and are committed to continuing on this path while remaining open to new opportunities that may arise, ensuring our future growth aligns with the solid foundation we’ve built.”