WELCOME TO

Cornerstone

About Us

Cornerstone Defense LLC is a Small Business servicing the Intelligence, Defense, and Space communities of the U.S. Government. Cornerstone Defense specializes in cloud architecture, enterprise engineering, systems and network engineering, systems and network security, and application and software development. We use these foundational technology areas to deliver solutions for data analytics, cyber, and space/mission operations, customized to meet mission requirements. We are headquartered in Herndon, VA, with employees working across the U.S including DC, MD, CO, UT, NM, HI, and CA. At Cornerstone Defense, you’ll find a partner that values strong relationships, excellence, and teamwork. Our team is a network of professionals who are dedicated to providing agile, secure, and efficient solutions to support mission success. With Cornerstone Defense, you’re not just choosing a service provider, but a committed, steadfast team with a culture designed to excel.

Vision & Mission

Meet The Team

Reilly Leonard

Chief Operating Officer

Reilly Leonard

Chief Operating Officer

Patrick Palmer

Chief Executive Officer

Patrick Palmer

Chief Executive Officer

Brian Sammons

Chief Financial Officer

Brian Sammons

Chief Financial Officer

Darcelle Wilson

VP of Human Resources

Darcelle Wilson

VP of Human Resources

Brandon Altmann

Chief Growth Officer

Brandon Altmann

Chief Growth Officer

Michelle Allen

Director of Systems and Security, FSO

Michelle Allen

Director of Systems and Security, FSO

Virginia Blair

Director of Marketing & Operations

Virginia Blair

Director of Marketing & Operations

Kaitlin Krywy

Managing Director, Aerospace & Defense

Kaitlin Krywy

Managing Director, Aerospace & Defense

Sean Wentz

Managing Director, MPO

Sean Wentz

Managing Director, MPO

WHERE CAN WE HELP?

To find out more information on where we can help you, services we provide,

joining or partnering with our team, please select one of the links below!

WHAT WE DO

We bring together a unique blend of cutting-edge capabilities, specialized expertise, and a remarkable company culture that focuses on the recruitment and retention of highly-sought-after employees.

Learn More

WORK WITH US

Search through all of our open positions.

Learn More

GET IN TOUCH

Contact Us
  • Virginia
    13454 Sunrise Valley Drive, Suite 100
    Herndon, VA 20171
    Maryland
    2288 Blue Water Blvd, Suite 330
    Odenton, MD 21113
  • eFAX
    443.769.1559
  • Phone
    703.691.5100
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We had our first ever Game Night at the office this past Friday and it was a blast! On the Border provided a delicious taco buffet and our amazing Director of Contracts made some absolutely delectable homemade margaritas to go with. 🌮🍹The favorites of the night were definitely Mario Kart on the N64, and we also had a hoot playing Taboo (it truly is the game of Unspeakable Fun, as they say! 🤣) Thanks to all those who attended, and we can't wait to have another game night soon and continue this new Cornerstone tradition! If you'd like to be invited to game nights in the future, drop us a comment and we'll make sure you are in the know. 👍🏻Any recommendations for other favorite game night games?! ... See MoreSee Less

We had our first ever Game Night at the office this past Friday and it was a blast! On the Border provided a delicious taco buffet and our amazing Director of Contracts made some absolutely delectable homemade margaritas to go with. 🌮🍹The favorites of the night were definitely Mario Kart on the N64, and we also had a hoot playing Taboo (it truly is the game of Unspeakable Fun, as they say! 🤣) Thanks to all those who attended, and we cant wait to have another game night soon and continue this new Cornerstone tradition! If youd like to be invited to game nights in the future, drop us a comment and well make sure you are in the know. 👍🏻Any recommendations for other favorite game night games?!Image attachmentImage attachment+7Image attachment

Donations have started to trickle in for Hurricane Helene Relief efforts! We will also be here tomorrow between 10AM-2PM to accept donations, all of which will be driven down to North Carolina this Monday, 10/7. Thank you all for your generous contributions so far and we hope to see quite a few tomorrow as well! Our office address is: 13454 Sunrise Valley Drive, Suite 100, Herndon, VA 20171. ... See MoreSee Less

Donations have started to trickle in for Hurricane Helene Relief efforts! We will also be here tomorrow between 10AM-2PM to accept donations, all of which will be driven down to North Carolina this Monday, 10/7. Thank you all for your generous contributions so far and we hope to see quite a few tomorrow as well! Our office address is: 13454 Sunrise Valley Drive, Suite 100, Herndon, VA 20171.Image attachment

In light of the devastating hurricane that has impacted North Carolina this past week, we have an opportunity to come together and support those in need. We are collecting donations to assist the affected communities and help them recover from this tragedy. We have a connection that will be filling several trailers and trucks with supplies and driving them down to North Carolina this coming Monday.

If you’re able to donate, we are looking for items from the list, below. They can be delivered to our office tomorrow between the hours of 9am-5pm or Saturday between 10am-2pm. Your generous contributions can make a significant difference in the lives of those who are struggling during this difficult time.

Let’s show our support and compassion for our neighbors in North Carolina. Thank you for your kindness and willingness to help.
... See MoreSee Less

In light of the devastating hurricane that has impacted North Carolina this past week, we have an opportunity to come together and support those in need. We are collecting donations to assist the affected communities and help them recover from this tragedy. We have a connection that will be filling several trailers and trucks with supplies and driving them down to North Carolina this coming Monday. 

If you’re able to donate, we are looking for items from the list, below. They can be delivered to our office tomorrow between the hours of 9am-5pm or Saturday between 10am-2pm. Your generous contributions can make a significant difference in the lives of those who are struggling during this difficult time.

Let’s show our support and compassion for our neighbors in North Carolina. Thank you for your kindness and willingness to help.

🏋️‍♀️ Invest in your fitness—and we’ll invest in YOU! 🏋️‍♂️

Our Fitness Reimbursement Program is just one of the many unique benefits Cornerstone Defense offers to keep our team strong, healthy, and thriving. Pay for your fitness expenses, submit your receipts, and get reimbursed up to $240 each year. It’s that simple! 💥

From wellness perks to career development, we’ve got you covered. To learn more about our company culture and benefits, check out our website today at cornerstonedefense.com/culture/.
... See MoreSee Less

🏋️‍♀️ Invest in your fitness—and we’ll invest in YOU! 🏋️‍♂️

Our Fitness Reimbursement Program is just one of the many unique benefits Cornerstone Defense offers to keep our team strong, healthy, and thriving. Pay for your fitness expenses, submit your receipts, and get reimbursed up to $240 each year. It’s that simple! 💥

From wellness perks to career development, we’ve got you covered. To learn more about our company culture and benefits, check out our website today at https://cornerstonedefense.com/culture/.

Meet Elena, our IT System Administrator who started with us in August! We have had the pleasure of working with her and she has quicky become a very important member of our team. She brings in such a positive attitude to the office and has helped make our tech processes and troubleshooting much more efficient. Check out the blurb from Elena, below, to learn a little more about her!

“Hello everyone! My name is Elena Thompson, I graduated with a degree in Business and Cybersecurity from Virginia Tech in 2023—Go Hokies! Now, as the IT System Administrator at Cornerstone, my goal is to ensure that our company’s IT infrastructure operates smoothly and securely. I truly value the opportunities for learning and growth here, and appreciate the welcoming culture that makes me feel like an integral contributor to the team. Outside of work, I love outdoor activities, playing sports with friends, going to the gym, and delving into self-improvement books. My experience at Cornerstone has been incredibly rewarding, allowing me to combine my passion for technology with a supportive community.”

We are so happy to have Elena with us and can’t wait to see what the future has in store for her here at Cornerstone Defense. Thank you for all that you do Elena, you are so appreciated! 😊
... See MoreSee Less

Meet Elena, our IT System Administrator who started with us in August! We have had the pleasure of working with her and she has quicky become a very important member of our team. She brings in such a positive attitude to the office and has helped make our tech processes and troubleshooting much more efficient. Check out the blurb from Elena, below, to learn a little more about her!

“Hello everyone! My name is Elena Thompson, I graduated with a degree in Business and Cybersecurity from Virginia Tech in 2023—Go Hokies! Now, as the IT System Administrator at Cornerstone, my goal is to ensure that our company’s IT infrastructure operates smoothly and securely. I truly value the opportunities for learning and growth here, and appreciate the welcoming culture that makes me feel like an integral contributor to the team. Outside of work, I love outdoor activities, playing sports with friends, going to the gym, and delving into self-improvement books. My experience at Cornerstone has been incredibly rewarding, allowing me to combine my passion for technology with a supportive community.”

We are so happy to have Elena with us and can’t wait to see what the future has in store for her here at Cornerstone Defense. Thank you for all that you do Elena, you are so appreciated! 😊
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