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

Matthew Monroe

Recruiting Manager

Matthew Monroe

Recruiting Manager

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
Globe
Comments Box SVG iconsUsed for the like, share, comment, and reaction icons

Timecards might not be the highlight of your week… but at least we can laugh about it together. 😅 We rounded up some of the funniest “do your timecard” memes to give you a smile (and a nudge 😉).

✅ Don’t forget to get yours done!

👇 And just for fun — drop a comment and tell us which meme was your favorite. Let’s see which one gets the most votes!
... See MoreSee Less

Timecards might not be the highlight of your week… but at least we can laugh about it together. 😅 We rounded up some of the funniest “do your timecard” memes to give you a smile (and a nudge 😉).

✅ Don’t forget to get yours done!

👇 And just for fun — drop a comment and tell us which meme was your favorite. Let’s see which one gets the most votes!Image attachmentImage attachment+2Image attachment

🎬✨”Real people, real feelings, that’s it, that’s all I’m interested in,” is a line from the 2000 movie Almost Famous (have you seen it!?) But it also perfectly sums up working at Cornerstone Defense.

They’re not about fluff or corporate buzzwords — just a team of smart 💡, mission-driven 🚀 folks who actually like working together 😄 (and it shows).

Want in? 👀 Check out the job board 👉 (Link in Bio)
... See MoreSee Less

🎬✨”Real people, real feelings, that’s it, that’s all I’m interested in,” is a line from the 2000 movie Almost Famous (have you seen it!?) But it also perfectly sums up working at Cornerstone Defense.

They’re not about fluff or corporate buzzwords — just a team of smart 💡, mission-driven 🚀 folks who actually like working together 😄 (and it shows).

Want in? 👀 Check out the job board 👉 (Link in Bio)

🎉 What does fun mean to us at Cornerstone Defense?
 
It means stronger teams.
It means better ideas.
It means we actually like coming to work.
 
These highlights come from our Q2 Company Newsletter — The Fun Edition!
👇 Featuring thoughts from across our leadership team:
✔️ CEO Pat on how fun is necessary for mental health
✔️ Reilly COO on joy in helping others
✔️ Ginny, Marketing Guru on how laughter and fun are contagious
✔️ Darcelle on the fun of witnessing employees’ growth
 
At Cornerstone, we believe culture isn’t just a buzzword—it’s something you build, live, and enjoy every day. And fun? That’s our not-so-secret sauce.
 
💬 How do you bring fun into your workday? We’d love to hear it!
... See MoreSee Less

🎉 What does fun mean to us at Cornerstone Defense?
 
It means stronger teams.
It means better ideas.
It means we actually like coming to work.
 
These highlights come from our Q2 Company Newsletter — The Fun Edition!
👇 Featuring thoughts from across our leadership team:
✔️ CEO Pat on how fun is necessary for mental health
✔️ Reilly COO on joy in helping others
✔️ Ginny, Marketing Guru on how laughter and fun are contagious
✔️ Darcelle on the fun of witnessing employees’ growth
 
At Cornerstone, we believe culture isn’t just a buzzword—it’s something you build, live, and enjoy every day. And fun? That’s our not-so-secret sauce.
 
💬 How do you bring fun into your workday? We’d love to hear it!Image attachmentImage attachment+1Image attachment

📸 Throwback to our old conference room — look closely at the whiteboard in the top right corner. 👀 See it?
 
“It has to make sense!”
 
That’s a phrase our COO wrote down one day, one of his favorites, and it just... stuck. For years, it lived on that whiteboard. Over time, it became more than a sticky note of wisdom — it became part of how we work, how we make decisions, and how we collaborate.
 
Whether it’s a big strategic move or a day-to-day workflow, we’ve learned: clarity matters, alignment matters — and yes, it has to make sense.
 
🧠💬 We’re curious: What does “it has to make sense” mean to YOU in your work life? When do you use this phrase, or when do you wish others would? Share your take in the comments 👇
... See MoreSee Less

📸 Throwback to our old conference room — look closely at the whiteboard in the top right corner. 👀 See it?
 
“It has to make sense!”
 
That’s a phrase our COO wrote down one day, one of his favorites, and it just... stuck. For years, it lived on that whiteboard. Over time, it became more than a sticky note of wisdom — it became part of how we work, how we make decisions, and how we collaborate.
 
Whether it’s a big strategic move or a day-to-day workflow, we’ve learned: clarity matters, alignment matters — and yes, it has to make sense.
 
🧠💬 We’re curious: What does “it has to make sense” mean to YOU in your work life? When do you use this phrase, or when do you wish others would? Share your take in the comments 👇

🎉 GIVEAWAY TIME! 🎉
Cornerstone Defense is leveling up your summer ☀️

Whether you’re chillin’ lakeside, fireside, or curbside—we’ve got the ultimate cooler slash backpack slash sit-upon chair ready for the ride. 🍻🎒🪑

We’re giving away 5 of these Cornerstone coolers and it’s easy to enter:
👇👇👇
✅ Comment below
✅ Tag a friend who would love our vibe (or our jobs 👀)
🕒 We’ll randomly select 5 winners 24 hours from now—and slide into your DMs to coordinate delivery!

This is your sign to sit back, sip cold, and rep a company where people actually matter. 💬
... See MoreSee Less

🎉 GIVEAWAY TIME! 🎉
Cornerstone Defense is leveling up your summer ☀️

 Whether you’re chillin’ lakeside, fireside, or curbside—we’ve got the ultimate cooler slash backpack slash sit-upon chair ready for the ride. 🍻🎒🪑

We’re giving away 5 of these Cornerstone coolers and it’s easy to enter:
 👇👇👇
 ✅ Comment below
 ✅ Tag a friend who would love our vibe (or our jobs 👀)
🕒 We’ll randomly select 5 winners 24 hours from now—and slide into your DMs to coordinate delivery!

This is your sign to sit back, sip cold, and rep a company where people actually matter. 💬
Load more