we are
OUR TEAM
Meet Our Leadership Team
Guido de Koning
CEO
Chris Petroff
VP of Business Development
Kurt Radkte
VP of Operations
Tiffany Serfustini
Director of Finance
Garth Hosch
General Superintendent
Guido de Koning
Chief Executive Officer
Guido is a seasoned executive with a track record of building high-performing teams aligned with energizing business strategies. He has served as Chief People Officer in several global organizations and brings cross-industry experience spanning operations, software, technology, and healthcare. Guido has led transformative initiatives through periods of rapid growth, M&A integration, restructuring, and cultural renewal. He began his career at Gallup, spending a decade consulting with global clients on building strengths-based cultures, improving engagement, and developing effective leaders.
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Originally from the Netherlands, Guido has lived and worked in the UK, Japan, Singapore, and Germany. He holds a Master’s degree in General Management from Nyenrode University and a Bachelor’s in International Business from the Haarlem Business School. He now lives in Scottsdale, Arizona with his wife, Rosa, and their sons, Michael and Ryan.
What excited you most about the future of Integrity?
Building a culture and future together that's both meaningful and rewarding. As an ESOP, we have a unique opportunity to empower our teams while they build equity ownership for the long term.
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If you're not working, what are you most likely doing?
Spending time with family. My wife and two boys are my primary ministry.
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What's your leadership philosophy in a sentence?
Discover people's natural strengths and build up an environment in which they thrive.
Chris Petroff
VP of Business Development
Chris Petroff is a native of Phoenix whose career has been defined by a deep commitment to community and economic development across the region.
With over 20 years of experience, Chris has played a pivotal role in shaping the Greater Phoenix area’s economic landscape. As Senior Vice President at the Greater Phoenix Economic Council (GPEC), he co-led the business development team responsible for recruiting and attracting major corporate expansions to the region. During his tenure, Chris was directly involved in more than 40 successful expansion projects, resulting in over 2,800 new jobs and nearly $500 million in net-new capital investment.
Chris also brings extensive experience from the construction industry, having worked for one of the nation’s largest commercial general contractors. In that role, he led business development efforts throughout the Southwest, with oversight across Arizona and Southern California, representing approximately $1.5 billion in annual project volume. In addition to client development, Chris contributed to strategic planning and business operations as part of the regional leadership team.
Chris holds a Master’s Degree in Organizational Leadership with an emphasis in Business Analytics from Grand Canyon University, and a Bachelor’s Degree in Business Management from Northern Arizona University. He lives in North Central Phoenix with his wife and two teenage children.
What excited you most about the future of Integrity?
I’m excited to build on Integrity Building Corporation’s 20-year legacy of success. Integrity has long been a trusted partner to our clients, and I’m proud to contribute to that tradition by supporting our clients through every step of their construction projects.
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If you're not working, what are you most likely doing?
When I’m not working, there’s a good chance you’ll find me at the ballpark cheering on our son or courtside at a volleyball game supporting our daughter—my favorite kind of doubleheader!
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What's your leadership philosophy in a sentence?
I lead with a servant leadership mindset—prioritizing the needs of others, empowering teams, and building trust through accountability and collaboration. When people feel supported and valued, they deliver their best work.
Kurt Radkte
VP of Operations
With over 30 years in the construction industry, Kurt Radtke is a proven operations leader with deep experience delivering complex projects across Arizona, Oregon, Washington, and Alaska. He is widely recognized for cultivating high-performing, collaborative teams, forging strong industry relationships, and applying a systems-driven approach to every facet of project execution.
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Kurt’s expertise in healthcare construction spans the full range—from specialty clinics to large-scale hospital expansions—such as the $243M Banner Gateway Medical Center and the $106M Banner Boswell Emergency Department and Patient Tower. His leadership on these technically demanding projects showcases his ability to manage complexity while aligning people, systems, and outcomes.
Beyond healthcare, he’s successfully led projects across diverse sectors including Higher Education, Aviation, Auto Dealerships, Chip Fabrication, Data Centers, Assisted Living, and Self Storage. His adaptability and understanding of sector-specific challenges add depth to his leadership.
A committed champion of Operational Excellence, Kurt focuses on aligning strategic planning with execution to ensure top-tier results in safety, quality, scheduling, and budget. Equally important is his role as a team builder and mentor—investing in talent development, empowering project leaders, and nurturing a culture of accountability, trust, and continuous improvement.
What excited you most about the future of Integrity?
The future of Integrity holds immense promise. I’m energized by the opportunity to collaborate with our exceptional team across the organization to build a strong, enduring foundation—one that not only supports our immediate goals but positions us for sustained growth over the next century and beyond.
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If you're not working, what are you most likely doing?
When I’m not working, I’m focused on what matters most—spending meaningful time with my family. I also enjoy exploring new places, embracing the outdoors, staying active with our dogs, following sports, and diving into hands-on home projects that keep me energized and balanced.
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What's your leadership philosophy in a sentence?
I believe in authentic leadership grounded in self-awareness and integrity—fostering trust through transparency, aligning actions with core values, and inspiring others through example.
Tiffany Serfustini
Director of Finance
Tiffany has over 20 years of experience in accounting and finance, and currently serve as Director of Finance, where she brings deep expertise in financial strategy, reporting, and compliance. She has worked extensively with public and international companies, managing high-performing accounting teams and leading initiatives that drive operational efficiency and financial integrity across companies.
A native of Arizona and proud mother of four (three boys and a girl), building her career in accounting from the ground up -- starting as a bookkeeper and growing into her current role with Integrity Building Corp. Along the way, she has worn many hats and gained hands-on experience in every area of the field. She brings a deep, practical understanding of finance that’s rooted in real-world problem-solving and leadership.
What excited you most about the future of Integrity?
I’m especially excited by the chance to contribute to a company that not only meet high standards of quality and safety to each project, but also directly improves people’s lives.
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If you're not working, what are you most likely doing?
If I’m not working, I’m most likely spending quality time with family. I also love to travel whenever I can, even if it’s just a weekend getaway. Exploring new places, cultures, and especially trying different foods is something I really enjoy. I’m always up for finding a great local spot to eat or cooking something new at home. For me, it’s all about creating memorable experiences and staying connected with the people and things that keep life balanced and fulfilling.
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What's your leadership philosophy in a sentence?
My leadership philosophy is to lead by example while working alongside my team to build trust, foster collaboration, and create a cohesive, goal-driven environment where everyone feels valued and empowered.
Garth Hosch
General Superintendent
Garth is a builder.
As a 3rd generation carpenter, he grew up in the shop and on jobsites, working with tools. For as long as he can remember, he has always found his comfort zone being involved with construction projects. From conceptual design to pre-construction planning, phasing, and field installation.
Garth enjoys working with people who are enthusiastic about construction concepts and pushing the industry in a positive direction. Team building with thoughtful and deliberate communication is something he is passionate about.
In his career, he has had the pleasure of working on all types of projects that vary in size and complexity from ground up through high end finishes. Structural multi story towers, Higher Education, Data Centers, Nuclear Power Stations, Health Care, Water Treatment Facilities, State Municipalities, Aviation, Custom Residential and more. He has been part of large teams and taken lead on smaller teams. He believes in open and honest lines of communication. He leads by example and takes pride in developing strong team dynamics.
What excited you most about the future of Integrity?
I am excited about the future of Integrity as we have a great team in place and a focus on growth for our team members.
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If you're not working, what are you most likely doing?
When I am not working, I love spending time with my family. I also enjoy playing music. I play drums in a working band!
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What's your leadership philosophy in a sentence?
Collaborative leadership is my approach to focus on teamwork, cooperation, and shared responsibility.