About us

Engineering Differently since 1987

Sigma Engineers and Constructors was conceived by employees who were tired of working for companies that did not truly appreciate the value of the relationships with their clients and their teammates.

They envisioned a fresh approach to the engineering marketplace. Through the years, Sigma Engineers and Constructors has become a destination workplace for both our employees and clients. Sigma – engineering differently since 1987.

Management Team

Robert B. Olivier, PE

Owner, Chief Executive Officer

Amy Guelfo

Chief Financial Officer

Eric Mistretta

Chief Operations Officer

Chris Foster

Executive Vice President of Production

Jenee Olivier

Executive Vice President of Internal Operations

Chris Kafkallides, PE

Vice President, E&I Department Manager

D. Todd Drummond, PE

Vice President, Senior Project Manager

Jarvus Ryes

Director of Business Development

Manville Borne

Director of Strategic Accounts

Ryan Hill, PE

Director of Engineering Quality

Tyler Murphy

Director of Production

Troy Blanchard

Director of Projects

Daniel Adkins

Director of Human Resouces

David Pearson

Director of Information Technology

Scott Plauche

Director of Asset Management
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Robert B. Olivier, PE
Owner, Chief Executive Officer
  • What's my Sigma history?

    I was hired in March 2006 to go-onsite at Marathon. After about a year, I came back to the office to run pipe stress and manage projects. Eventually, I became Piping Department Manager. Other roles I’ve had the joy to play in are Mechanical Department Manager, COO, CEO, President, and Owner.

  • Why do I love Sigma?

    Family. That’s the best word for it. Others would be authenticity, passion, fun, competitive, creative, empowering, and caring.

  • What would you be doing if you didn’t work for Sigma?

    A goat herder in Yemen.

  • Hobby or Interests:

    Sports, Music, and Fine Spirit Connoisseur

  • Name one item on your bucket list:

    To scare Kelly so bad that both of her shoes fly off. Other than that, a Whisky tour of Scotland.

  • Favorite Holiday (and why):

    Christmas. Fantastic childhood memories, making new memories as a husband and father, and taking that time each year to be humbled in my faith, grateful for life and to share love with everyone that I love. And in a former life, I may or may not have been Clark Griswold.

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Amy Guelfo
Chief Financial Officer
  • Why do I love Sigma?

    The number one thing I can say is family, it really is that simple. From the top down you can see the love that everyone has for everyone else. It is amazing to be able to walk through an office and see that people aren’t miserable. How cool is it to get up and look forward to going to work?

  • What I would do if I didn’t work for Sigma?

    Conduct reviews for a travel magazine or bartender at the beach.

  • Hobby or Interests:

    Travel, Baking, Cooking, Listening to music/going to see live music, Eating new foods/restaurants

  • One item on my bucket list:

    Go to Ireland, love to travel and I have a lot of Irish in me.

  • If you had a superpower, what would it be (and why)?

    Swim under water without any special tools. There are so many beautiful things under water and around the water. It would be an awesome way to travel.

  • Favorite Holiday:

    Thanksgiving – Get to be with family, get to cook, and back and get to eat. It is the most relaxing holiday for me and always seem to be happy.

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Eric Mistretta
Chief Operations Officer
  • What's my Sigma history?

    3 months and counting

  • Why do I love Sigma?

    The family culture and authentic and fun-loving people!

  • What would you be doing if you didn’t work for Sigma?

    A master limbo instructor in the Bahamas!

  • Hobby or Interests:

    Flying, Hunting, and Theater/Musical set and prop designs.

  • Name one item on your bucket list:

    To dog fight in a P-51 Mustang

  • Little Known Fact:

    I can make just about anything out of foam. I use it quite a bit in prop designs for theaters.

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Chris Foster
Executive Vice President of Production
  • What's my Sigma history?

    I started the industry in 1989 and joined Sigma in 2009.

  • Why do I love Sigma?

    Because they bought me 720 buckets.

  • What would you be doing if you didn’t work for Sigma?

    Trophy Husband

  • Hobby or Interests:

    Competitive Duck Herding

  • Celebrity You’d Most Like to Meet (and why):

    Rupaul, Big Freida

  • Favorite Holiday:

    Octoberfest

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Jenee Olivier
Executive Vice President of Internal Operations
  • What's my Sigma history?

    15 years ago Danny offered me a job that I could not pass up.

  • Why do I love Sigma?

    This is my family.

  • What would you be doing if you didn’t work for Sigma?

    Running an HR and safety consulting company and doing more volunteering.

  • Hobbies:

    Running and Shopping

  • What did you want to be when you grew up and why?

    Designer (love to design clothes)

  • Little Known Fact:

    Part-time meteorologist and Weather Bug Stalker

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Chris Kafkallides, PE
Vice President, E&I Department Manager
  • What's my Sigma history?

    15 Years

  • Why do I love Sigma?

    I love Sigma because it has a family-like atmosphere and flexible schedule.

  • What would you be doing if you didn’t work for Sigma?

    Major league soccer manager/coach.

  • Hobby or Interests:

    Soccer, fishing, traveling, and spending time with family and friends.

  • Name one item on your bucket list:

    Go to a World Cup Final Four

  • Favorite Holiday (and why):

    Greek Easter is my favorite holiday. I spend the entire day prepping and cooking a whole lamb on the fire pit.

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D. Todd Drummond, PE
Vice President, Senior Project Manager
  • What's my Sigma history?

    25 Years

  • Why do I love Sigma?

    Sigma is a fun place to work that truly cares about its employees.

  • What would you be doing if you didn’t work for Sigma?

    I like to work with people and lead engineering efforts, so probably a manager at a plant or an engineering firm.

  • Celebrity You’d Most Like to Meet (and why):

    I would like to meet Elon Musk, his accomplishments in engineering in his companies are impressive and he is creating world-influencing technology.

  • Favorite Holiday (and why):

    Christmas is my favorite time of year, lots of time with family, deer hunting, and holiday cheer.

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Jarvus Ryes
Director of Business Development
  • What's my Sigma history?

    Relatively new to Sigma as an employee, but I have known many of the great people here for quite some time.

  • Why do I love Sigma?

    Sigma has a great environment with management that listens, actively participates, and cares.

  • Hobby or Interests:

    Animals, Hunting, Fishing, Cars, Tinkering

  • If you had a superpower, what would it be?

    The ability to speed up traffic. WHY?? We live and or work around Baton Rouge!!

  • Little Known Fact:

    I ate nine hamburgers on a Thursday before one of my high school football games.

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Manville Borne
Director of Strategic Accounts
  • What's my Sigma history?

    Joined in November 2018 to help grow and better the Sigma offers.

  • Why do I love Sigma?

    The people and the lack of BS.

  • What would you be doing if you didn’t work for Sigma?

    Professional Bourre' Player.

  • Hobby or Interests:

    Time with family traveling, hunting and fishing, and not playing golf well.

  • Favorite Musician (and why):

    Louis Armstrong-because he was and is the best...

  • Little Known Fact:

    I was a cotton top with a full head of hair till 6th grade.

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Ryan Hill, PE
Director of Engineering Quality
  • What's my Sigma history?

    Going on 15 years with the company. Hired in 2007 as a Mechanical Engineering Intern and was hired full-time in 2009 upon graduation from LSU. Worked in the Sigma office from May 2009 to June 2010. Worked contract onsite for one of our clients from June 2010 to June 2012. Came back to the Sigma office in June 2012 and have been here ever since.

  • Why do I love Sigma?

    Although Sigma has been the only place I have worked in my engineering career, I can say with confidence there is no other place I would rather be. The camaraderie from top to bottom, I believe, is unparalleled. Each person wants the one next to them to succeed, and it shows in our execution of projects. When you enjoy the people you work with, it does not really feel like work

  • What would you be doing if you didn’t work for Sigma?

    If I were not working for Sigma, I would be a lifeguard on a beautiful beach somewhere. Even with my fair skin, I have always loved the beach and ocean. Figure if I must work anywhere, may as well be somewhere I love.

  • Hobby or interests:

    Sports and the gym are my two main interests and reading when I can.

  • What did you want to be when you grew up (and why):

    When I was younger, I vividly remember wanting to be an Anesthesiologist for reasons I do not remember. I am sure I saw one in a tv show or movie that sparked my interest in me. Viewing the profession from the outside, it does seem like engineering in terms of being very meticulous and technical, which obviously appeals to me in my chosen profession.

  • Favorite holiday (and why):

    Christmas, hands down. As long as I have been in charge of decorating, the day after Thanksgiving is when the tree and decorations go up. I have always loved the Christmas season since I was a kid, and that has continued through adulthood. I enjoy all the festivities, Christmas lights, Christmas programs, Christmas Eve church service, you name it. The weeks leading up to Christmas and the anticipation are the best parts. Now I get to enjoy watching my own kids’ excitement throughout the time leading up to Christmas and then on Christmas day.

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Tyler Murphy
Director of Production
  • What's my Sigma history?

    10 years...Civil/Structural Engineer - Project Manager - Project Director

  • Why do I love Sigma?

    Family-oriented and everyone looking out for each other. We have fun and have relationships that enable us to challenge each other to grow and be the best version of ourselves.

  • What would you be doing if you didn’t work for Sigma?

    Real Estate Mogul!

  • Hobbies or Interests:

    Hunting, fishing, outdoors, sports, and spending time with my amazing wife and kids!

  • If you had a superpower, what would it be (and why):

    Time travel...who wouldn't want to take knowledge and experience from today and apply it in the past.

  • Favorite Holiday (and why):

    Thanksgiving! Plenty of food and a trip to the camp after every year.

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Troy Blanchard
Director of Projects
  • What's my Sigma History

    I started at Sigma in June of 2021 as a project manager and took over as Director of Projects in January of 2024.

  • Why do I love Sigma?

    In two easy words: "The Culture" Sigma is always family first and goes above and beyond to take care of its people.

  • What Would You Be Doing If You Didn't Work for Sigma?

    Superior bartender. Can’t get enough of the margaritas!

  • Hobby or Interests:

    Duck hunting is my passion but if it involves the outdoors I’m in. I love fishing with my kids coaching whatever sports activities they are into!

  • Name one item on your bucket list:

    Visit the Sistine Chapel

  • Little Known Fact:

    I got on stage with the band at my wedding reception and sang “The Dance” by Garth Brooks to my wife!

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Daniel Adkins
Director of Human Resouces
  • What's my Sigma history?

    December 2023

  • Why do I love Sigma?

    I love Sigma for its fun culture and great teammates. From the moment I walked through the doors, I felt welcomed by a company that values each employee's unique contributions and perspectives. Every day at Sigma is a new adventure and fast paced. With such a great culture, talented employees and a clear vision for the future it's no wonder why I am proud to be a part of the Sigma family.

  • What Would You be Doing if You Didn’t Work for Sigma?

    I’d be a professional world traveler that blogged my adventures.

  • Hobby or Interest:

    Travel, learning about history, nerding out on Star Trek!

  • If you had a superpower, what would it be?

    The ability to fly. Any chance to get out of traffic would be a win for me.

  • Useless Skill I Possess:

    I can play champion caliber tic tack toe!

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David Pearson
Director of Information Technology
  • What's my Sigma History?

    June 2023

  • Why do I love Sigma?

    I love Sigma because I’m pushed when I need to be pushed and consoled when I need to be consoled. People Matter!

  • What Would You be Doing If You Didn't Work for Sigma?

    Star Wars imperial fighter pilot.

  • Hobby or Intrest:

    Cooking, Coaching, Video Games, Star Wars

  • Name one item on your bucket list:

    I want to travel to Hawaii, I have been all over the world but never there. Must See!

  • Favorite Holiday

    Easter, All others don’t seem to matter much in comparison to the entire reason of we belong to Heaven. Jesus!

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Scott Plauche
Director of Asset Management
  • What's my Sigma history?

    15 Years

  • Why do I love Sigma?

    I love Sigma because it has a family environment, it’s self-managed and fun.

  • What would you be doing if you didn’t work for Sigma?

    Diving with great white sharks.

  • Hobby or Interests:

    Diving, cooking, hunting, photography, travel and woodworking.

  • Name one item on your bucket list:

    Dive the Big Blue Hole.

  • Celebrity you’d most like to meet (and why):

    Henry Cavill, because he is Superman and he can fly.

  • Useless skill I possess:

    I know how to breakdown and de-nail pallets.

So, what makes us unique?

A Different Approach to Business

Privately owned and operated by Engineers, Sigma has created a culture that empowers employees and clients to choose relationships and projects that fit our values and ultimately act as an extension of our clients. Our expertise delivers creative solutions, many times where others have not been successful. This approach has resulted in extraordinary retention of clients and employees who create big company solutions with a small company feel.

An Unsurpassed Pursuit of Excellence

We attempt to be perfect, but realize the reality and challenges with this goal. This aspiration drives our relentless quest for improvement. Sigma’s leadership team, project managers, and department managers meet regularly to fine-tune our internal and external procedures and discuss new ways to meet challenges. We are constantly learning and discovering methods to become more effective leaders, enhance customer service, set the industry standard for quality, and deliver the results which have built our reputation and our client success.

Purpose

To provide a culture that empowers and inspires our employees to loyalty, pride, and success through our passionate commitment to engineering excellence for our family of clients.

Vision

To be the choice destination for employees and clients that align with our culture and values by supplying big company capabilities with a small company feel.

Why choose sigma

With capabilities and experience in projects of varying sizes, our focus is on small and mid-cap project execution with the goal of developing long-term relationships that withstand the ups and downs of our industry.

We firmly believe that each employee is a part of our client experience, from professionals helping manage projects to our highly skilled technical teams. This attitude permeates our team and is one of our keys to successfully producing quality work time after time, on every project. Our attention to detail and effort we put into relationship management reflects the deeply personal touch needed to develop a true team approach for successful project execution.

To ensure we maintain our unique culture and fulfill our brand promise to our clients, we’ve developed a RECIPE to guide us.

OUR RECIPE FOR SUCCESS

R

Relationships

(Over Profits)
We are going to take care of our people and our clients, and the money will take care of itself.

E

Energy

(We Have Fun)
When it’s exciting to come to work, people are happy and perform at a higher level. This contagious energy is spread to our clients and deepens the relationship we have with them.

C

Committed

(And Competitive)
We are uber-competitive and we set out to be the absolute best company for our team members and our clients. Our goal is to constantly improve, which takes discipline, sacrifice, and dedication. We are committed to put in the work to improve every day.

I

Imperfect

(Admittedly)
The only way to get better is to own our mistakes and use them as a foundation for improvement.

P

Protect

(Our culture and our family)
Part of continuing to be a great place to work is being fiercely protective of our people and the environment we’ve created.

E

Empower

(Our employees to be the best version of themselves)
We recognize potential and an employee’s desire to be better, and we give them the support and inspiration to advance and potentially become a leader.

We have demonstrated that we can provide high quality engineering at an all-in rate that consistently beats our competitors while maintaining an engineering error rate significantly below the industry average.

Let us know how we can help you.

Safety

Management’s strong focus on safety strategies extends from our corporate office to our interaction with clients, to when we set foot on a job site.

Part of our safety program is making sure our employees are sensitive and adapt to the protocols our customers have in place at their facilities. When we are all safe, everyone gets to leave work and go home to the most important people in their lives and enjoy the fruits of their labor.

Come be a Part of the Sigma Family

Great job, good benefits and an atmosphere like no other. You’ll love it here!

JOIN THE TEAM