Executive Leadership Team

Summit Human Capital strongly believes in the power of a Master Mind Group in a continuous effort to provide unprecedented innovation to our ecosystem. You will see below our very own Master Mind Group in the form of Summit Human Capital’s Executive Leadership Team (ELT) Advisory Board. Our ELT Advisory Board is comprised of seasoned veterans with over fifty years of combined experience covering Marketing, Technology and Technology Human Capital solutions. Get to know our family and read their “About” bio below!


Glenn Diersen

Founder & President

Glenn has always been an entrepreneur at heart, launching a lawn maintenance business at the age 12 and a successful painting business in college.

Upon graduating with a BS degree in International Business and a BA degree in Spanish from James Madison University in 2013, Glenn found his niche in the technology human capital industry, when he started his career at The Select Group (approximately a $150 million/year IT staffing company) in 2014 as a Technical Recruiter. He was promoted to Account Management within four months which at that time was the fastest promotion in company history. One year later, he carved out a role as the first-ever Account Executive of Government Services at The Select Group Federal and ended 2017 as the overall Top Producer, finishing ahead of over 200 other producers! Just a few months later he founded Summit Human Capital.
His successes fueled his entrepreneurial spirit and in April of 2018 he launched Summit Human Capital, an IT human capital solutions firm headquartered in Richmond, Virginia. Fast forward to 2020 and Summit Human Capital boasts over 30 active clients across eight states with over 30 Associates and has surpassed $30,000 in weekly spread.

In 2019, its first full year, the company reported just shy of $2 million in revenue and grew by more than 3,000 percent from 1 to 33 Full-Time Associates.

Glenn is a recipient of the prestigious SIA (Staffing Industry Analysts) ’40 under 40,’ an award honoring the workforce ecosystem’s next generation of leaders.

Glenn Diersen began his journey in the technology workforce solutions industry in 2014 where he earned the privilege of standing up the Public Sector Practice from the ground up for a $100 million+ national firm. In less than five years there, he led the Public Sector Practice in exceeding over $20 million in annual revenues across the nation. Glenn, a lifelong entrepreneur, then decided to launch Summit Human Capital in his birthing city of Richmond, Virginia. Fast forward five years later, Summit Human Capital is the #1 fastest growing technology workforce solutions firm in America boasting over 14,413% 3-Year Revenue Growth, placing Summit Human Capital as the #20 Inc. 5000 2022 fastest growing company in the United States industry agnostic.

Nina Ildari

Nina Ildari

Chief Executive Officer

Nina’s relentless determination to always put our clients and career seekers first is what Summit Human Capital is all about. Nina embodies the company’s Key Core Values inside and outside of work. She has worn many hats at Summit Human Capital and started off supporting Summit as a Senior HR Generalist. She now serves Summit Human Capital as their Manager of Operations and has been an instrumental member of the Executive Leadership Team since Summit’s conception.

Nina graduated from West Virginia University in 2016 and has been in the technology human capital space ever since. Nina continues to contribute to Summit’s company growth and we are honored to have Nina as the face of all back-office operations.

Jason Seibel

Dr. Jason Seibel

Chief Operating & Innovation Officer

Dr. Jason Seibel boasts an extensive career spanning more than 25 years, encompassing a broad spectrum of executive roles within both commercial enterprises and the federal government sector. His professional background is distinguished by expertise in business development, operational management, financial acumen, and information technology proficiency, underpinned by an extensive comprehension of automation, corporate integrations, restructurings, and turn-around initiatives.

Throughout his career, Dr. Seibel has demonstrated remarkable versatility by successfully owning, operating, and divesting multiple enterprises. As the founder of the strategic consultancy firm, Performance Management Group, Dr. Seibel aided corporations in formulating and executing strategic initiatives. Previously, Jason Seibel held the roles of CEO, board member, and senior corporate executive at esteemed organizations such as QTC, ARHomes, Lockheed Martin, CACI, and Lumen (formerly known as CenturyLink). In addition, Dr. Seibel contributed to the academic community as a professorial lecturer at both George Washington University (GWU) School of Engineering & Applied Science and Virginia Commonwealth University (VCU) School of Business.

Dr. Seibel's professional legacy is punctuated by groundbreaking achievements in various domains, including pioneering innovations in parimutuel wagering, the development of medical geospatial systems, and the creation of cutting-edge strategic planning platforms. His academic credentials are equally impressive, holding a Doctor of Science in Systems Engineering & Operations Research, a Master's degree in Systems Engineering, and an undergraduate degree in Information Systems and Business. Moreover, he boasts a plethora of certifications, including the coveted Project Management Professional® designation.

Matthew Tartaglia

Executive Vice President, Commercial Operations

Matthew started his professional career in hospitality management where he progressed into a General Manager/Managing Partner of independent and franchise restaurants. In 2011, while with BW&R, he was recognized as the franchise "General Manager of the Year" out of 100+ qualifiers.

Having reached many milestones within the industry, in conjunction with his vision to excel outside of hospitality, Matthew joined The Select Group in 2013 as a Technical Recruiter. He quickly established himself as a top recruiter in the company, and within 9 months, was promoted to Account Management. As an Account Manager, Matthew broke a company record by compiling $10k of weekly spread in only 4 months. He was presented a companywide award for Account Manager “Rookie of the Year”.

In 2016, as an Account Executive at Hays, Matthew landed the #2 ranking on the list of Top 100 Revenue Producers and was also an Award recipient. He has hit $20k in weekly spread on three separate occasions starting from $0.

While Managing Director at Diversant, in September of 2017, Matthew launched a start-up office in a 2 desk WeWork space - no clients, $0 in revenue. 20 months later, with all homegrown accounts, the team hit a remarkable milestone and All-Time High of $45k in weekly spread, a run-rate of ~$10 million annually, and 157% of goal – including a streak of 8 consecutive quarters.


Matt Cornelius

Technology Human Capital ELT Advisory Board Member

Matt has over 16 years of staffing experience working for both startup and large companies. Throughout his career, Matt has worked as a Technical Recruiter, Account Manager, Sales Manager and Vice President. As the first Vice President of a small boutique IT staffing firm, they grew revenue by over $120M and opened up 10 new offices in his 7 years with the company. Currently, Matt is the CEO and Founder of Tobacco Road Search, which is a direct placement search firm that specializes in placing top level talent across the country with IT staffing companies.


Dontrese Brown

Marketing/Branding/Storyteller ELT Advisory Board Member

Dontrese is relentless in his pursuit of helping others maximize their potential. His commitment to transformational leadership and serving the youth of our communities is the driving force that inspires all those around him. A remarkable communicator and influencer, he fosters a culture of excellence through a compelling vision of respect, integrity and empowerment.

Throughout his career, Dontrese has led various teams from a creative and professional development perspective, and he is passionate about brand design, creative strategy and the business of design. Most recently, Dontrese led the historical movement and initiative to re-name the Boulevard to Arthur Ashe Boulevard for our City of Richmond as well as leading the vision to make Cristo Rey Richmond High School a reality for the under-served youth of our Richmond communities.