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Our Team

Alan Bieberstein

Cornerstone's President

Having been an Electrician most of his adult life, he has always loved this line of work. Alan went through a 4 year apprenticeship program, working for various electrical contractors and on a variety of projects. Wherever he worked he was always promoted due to his eagerness to expand his knowledge and his love of this work. In 2005, Alan took everything he owned and with a small Astro van started Cornerstone Electrical Contractors. His reputation for quality, knowledgeable work soon spread, and he quickly found the business growing. Cornerstone Electric has maintained that growth and positive customer relationship throughout the years. Alan’s ability to instill his values of the business into the employees is what helps this company continue to grow. Alan is married to his very patient and lovely wife, Margaret. He has three daughters, three sons and multiple grandchildren that help keep him active.

“I love finding solutions to problems, whether they are more innovative methods or empowering the workforce, it keeps me motivated every day.”

Alan Bieberstein

Cornerstone's President

Having been an Electrician most of his adult life, he has always loved this line of work. Alan went through a 4 year apprenticeship program, working for various electrical contractors and on a variety of projects. Wherever he worked he was always promoted due to his eagerness to expand his knowledge and his love of this work.
In 2005, Alan took everything he owned and with a small Astro van started Cornerstone Electrical Contractors. His reputation for quality, knowledgeable work soon spread, and he quickly found the business growing. Cornerstone Electric has maintained that growth and positive customer relationship throughout the years. Alan’s ability to instill his values of the business into the employees is what helps this company continue to grow.
Alan is married to his very patient and lovely wife, Margaret. He has three daughters, three sons and multiple grandchildren that help keep him active.

“I love finding solutions to problems, whether they are more innovative methods or empowering the workforce, it keeps me motivated every day.”

Joan Slocum

Financial & Administrative Support

Her responsibilities include bookkeeping, office management and human resources. She loves organization, giving attention to detail, promoting a positive atmosphere and being a part of the Cornerstone team.

Before devoting herself to Cornerstone, Joan used her experience as a professional ballet dancer to teach dance to K-5th graders, providing much needed arts education for Tucson public school students. Joan is a wife, mother of four daughters and one son-in-law, and a proud grandmother.

“Whatever you do, work at it with all your heart, as working for the Lord.” Colossians 3:23

Joan Slocum

Financial & Administrative Support

Her responsibilities include bookkeeping, office management and human resources. She loves organization, giving attention to detail, promoting a positive atmosphere and being a part of the Cornerstone team.
Before devoting herself to Cornerstone, Joan used her experience as a professional ballet dancer to teach dance to K-5th graders, providing much needed arts education for Tucson public school students. Joan is a wife, mother of four daughters and one son-in-law, and a proud grandmother.

“Whatever you do, work at it with all your heart, as working for the Lord.” Colossians 3:23

Chelsea Begay

Project Coordinator

Chelsea provides assistance to the projects and confirms the day-to-day operations flow smoothly. She coordinates with all team members involved ensuring specialty products, equipment deliveries, purchase orders and safety requirements are managed to meet everyone’s schedules. Her sales and marketing background allows her to understand and maintain great relationships with our suppliers, contractors, and clients.

Recently, Chelsea has decided to finish her college education in Project Management. Her interests include the Young Builder’s Committee of Southern Arizona and Women in Leadership/Construction programs and associations.

In her free time, she is a powerlifter, a cat mom, and a music lover who enjoys live shows/concerts.

“Do something today that makes the day better than yesterday – Win the day.”

Chelsea Begay

Project Coordinator

Chelsea provides assistance to the projects and confirms the day-to-day operations flow smoothly. She coordinates with all team members involved ensuring specialty products, equipment deliveries, purchase orders and safety requirements are managed to meet everyone’s schedules. Her sales and marketing background allows her to understand and maintain great relationships with our suppliers, contractors, and clients.

Recently, Chelsea has decided to finish her college education in Project Management. Her interests include the Young Builder’s Committee of Southern Arizona and Women in Leadership/Construction programs and associations.

In her free time, she is a powerlifter, a cat mom, and a music lover who enjoys live shows/concerts.

“Do something today that makes the day better than yesterday – Win the day.”

Jeff Smith

Warehouse Manager

Jeff supervises daily warehouse activities, including quality assurance, inventory control, space management, logistics, floor productivity, shipping, and customer service.

Coming from a production background, Jeff uses those skills in Cornerstone’s pre-fabrication, delivery, and warehouse maintenance.
Locating the proper material, on-time and cost effectively, is Jeff’s greatest asset. He is always searching for the most innovative products that can assist Cornerstone employees in production and safety.

In his spare time Jeff enjoys planning programs for children at his church, especially ones that involve prop construction or planning crafts and games.

Sometimes you have to “Just Do”

Jeff Smith

Warehouse Manager

Jeff supervises daily warehouse activities, including quality assurance, inventory control, space management, logistics, floor productivity, shipping, and customer service.

Coming from a production background, Jeff uses those skills in Cornerstone’s pre-fabrication, delivery, and warehouse maintenance.
Locating the proper material, on-time and cost effectively, is Jeff’s greatest asset. He is always searching for the most innovative products that can assist Cornerstone employees in production and safety.

In his spare time Jeff enjoys planning programs for children at his church, especially ones that involve prop construction or planning crafts and games.

Sometimes you have to “Just Do”
2201 E 21st St
Tucson, AZ 85719
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(520) 733-6250
Mon - Fri | 6 AM to 3 PM

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