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 R. Diersen Jr. has always been an entrepreneur at heart, launching a lawn maintenance business at the age of 12 named “Diersen Delivers” followed by a successful painting business in college exceeding six figure revenues before the age of 20.

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 workforce solutions industry when he started his career in the field with an established firm with revenues in excess of $150 million in 2014 as a Technical Recruiter. He was promoted to Account Management within four months, the fastest promotion in that company's history! One year later, he carved a role for himself as the first-ever Account Executive of Government Services, standing up their Federal practice from ground zero. Just four years later, Glenn led the federal practice in driving over $20 million in annual revenue to the company and as a result was named the fastest growing vertical across the nation. Glenn ended 2017 as the overall Top Producer, finishing ahead of over 200 other producers.

His successes fueled his entrepreneurial spirit and in April of 2018 he launched Summit Human Capital, a technology workforce solutions firm headquartered in Richmond, Virginia.

In 2019, its first full year, the company reported just shy of $2 million in revenue and grew by more than 3,000 percent.

In 2021, Summit Human Capital was named Richmond, Virginia’s #1 fastest growing company boasting 2-year revenue growth of 2,489%.

In 2022, in Summit Human Capital’s first year of eligibility, the globally renowned Inc. 5000 listed Summit Human Capital as the #1 fastest growing company in both Virginia and the Mid-Atlantic and was listed as the #20th fastest growing company across the United States boasting a three-year growth rate of 14,413%. Summit Human Capital is, statistically, the fastest growing technology workforce solutions company in America.

Fast forward to 2023 and Summit Human Capital has brokered relationships with over 100 clients across the United States with a distributed workforce covering close to forty states and counting.

Glenn is a recipient of the prestigious SIA (Staffing Industry Analysts) 2020 ’40 under 40,’ an award honoring the workforce ecosystem’s next generation of leaders. Glenn was also named to Forbes Next 1000 in 2021. Glenn was included in Virginia Business’s 2023 100 People to Meet: Go-Getters. Glenn was listed to the Marquis Who’s Who 2023 biographical volumes.

Glenn is a workforce solutions trailblazer and absolute disrupter.

Most importantly, Glenn is married to his wife of over five years, and they have been blessed with two beautiful girls calling Richmond, Virginia their home. When Glenn is not spending time with his family or working on his career, you will most likely find him enjoying a workout on the tennis courts or reading a book on business.

Glenn wakes up every morning getting to go to work rather than having to because he is committed to advancing the Mission of Summit Human Capital to positively change as many lives as possible across the world.

Nina Ildari

Nina Ildari

Chief Executive Officer

Nina’s relentless determination to always put our clients and career seekers first aligns flawlessly with Summit Human Capital’s Mission to change lives. Nina embodies the company’s Key Core Values inside and outside of work. Nina has been in the workforce solutions space for almost a decade.

Before joining as Summit Human Capital’s CEO during the very early stages of Summit’s conception, she ran her own HRaaS (Human Resources as a Service) business where she was on retainer with almost twenty clients.

Despite her thriving business, she still left her growing venture because of the opportunity she saw in Summit Human Capital’s Vision. Given her level of success, she was recognized by the Gustav Publication by being inducted into the “World Staffing Summit Awards” in 2021!

With her in-depth knowledge and wisdom in the workforce solutions space, Nina’s experience continues to be instrumental in driving the growth of Summit Human Capital across the country and eventually the globe.

Nina graduated from West Virginia University in 2016 and has been in the business of changing lives ever since.

Personally, Nina Ildari is married to her husband and has welcomed two beautiful daughters to the world. When she is not advancing the Mission of Summit Human Capital, you can find Nina doing what she loves most, spending time with her family. She loves to travel and enjoys pushing herself physically to live the greatest life she can by prioritizing her health.

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.