Calhoun W. Cox, Jr., Founder

Cal Cox grew up in Seneca, South Carolina and received his Bachelor of Science from Clemson University in 1964.

He served in the Army Corps of Engineers/Special Forces for seven years and is a veteran of the Vietnam War.

Cal worked in the construction industry for 36 years and founded Calcon Constructors in 1981 in Denver, Colorado.

Throughout the years, Cal served as the President of the Associated General Contractors of Colorado, as well as on numerous boards and committees. 

James P. Bosshart, Co-Founder and Chairman

Jim graduated with distinction from Iowa State University with a Bachelor of Science in Construction Engineering.

Jim co-founded Calcon Constructors in 1981 and currently serves as Chairman. He is involved in all business aspects, including marketing, estimating, project management and office management.

Jim is very involved in the industry; he has served on many committees, including a position as Executive Committee Board of Directors for the Associated General Contractors of Colorado.

Joseph S. Gallion, Jr., CEO

Joe, who received his education from Colorado State University, has been with Calcon since 1982, and currently serves as the company’s CEO.

Joe is responsible for all business aspects, including: marketing, estimating, project management and field management.

He remains very active in the construction industry, and has held positions as the Chairman of Colorado Neurological Institute, Chairman of the Board for Southwest Family YMCA and as the past President of the Construction Industry Training Council.

Presently, Joe sits on the board of AGC Colorado and is a member of the National Western Stock Show.

When not in the office, Joe enjoys golfing, skiing, cycling and traveling.

Brian Mortimore, President

Brian has been with Calcon since 1999 and is currently a President of the company. He is a proud CSU alumnus and graduated with a Bachelor’s degree in Construction Management.

With over 20 years of experience in Project Management, Brian is a vital asset to Calcon’s customers and vendors.

Brian has completed many notable projects for Calcon in the retail, technical, healthcare and mixed-use categories.

He is LEED AP certified and a Certified Healthcare Constructor.

In his free time, Brian enjoys golf, the outdoors and spending family time with his wife and twin girls.

Jim Sexton, CFO and Vice President

Jim Sexton has dedicated his career to construction-related accounting and finance since relocating to Colorado in 1999. Joining the Calcon Team in 2013, he brings extensive expertise as a Certified Public Accountant (CPA) and Certified Construction Industry Financial Professional (CCIFP). Jim earned his Bachelor of Science in Accounting from Northern Illinois University.

Currently serving as CFO, Vice President, and Stockholder, he oversees all facets of accounting, financial reporting, information technology (IT), and human resources (HR).

Outside the office, Jim finds solace in golfing and exploring the great outdoors of Colorado.

Jeff Johnson, Vice President

Jeff joined Calcon in 2007 and is currently a Vice President of the company.

He has a Bachelor’s degree in Construction Management from CSU and brings 19 years of Project Management experience to the table.

Jeff has completed many of Calcon’s most notable builds in the healthcare industry, including: specialty medical facilities, medical office buildings and hospitals.

Jeff is a LEED Green Associate, Certified Healthcare Constructor and a member of CAHED and ASHE.

When not at work, Jeff enjoys time with his wife and two girls.

Jim Van Zant, Vice President

Jim joined the Calcon family in 1986 and has been in involved in many of our most notable builds.

Jim graduated from Colorado State University with a Bachelor of Science degree in Industrial Construction Management.

He is currently a Vice President and also serves as a Senior Project Manager. He handles pre-construction, estimating and project management for Calcon’s projects, seeing them through construction, closeout and warranty

Jim presently serves as Treasurer and on the Board of Directors for the Construction Industry Training Council (CITC), which offers apprenticeship programs for the construction trades.  He is also a member of the American Society for Healthcare Engineering and has received their Healthcare Contractor’s Certificate.  He has served as an instructor for a project management class offered by Associated General Contractors.

When not in the office, Jim enjoys the outdoors, his family and his ever growing motorcycle collection.

Construction Estimator

An Estimator at Calcon Constructors, Inc. is primarily responsible for preparing project estimates with an emphasis on multi-family and commercial projects.   An Estimator will aid in the estimating, planning, and execution of projects from initial concept and throughout the preconstruction phase.  Since nearly all of our work is negotiated with repeat and referral clients, an Estimator will promote customer focused approaches to preconstruction efforts by anticipating customer needs and expectations, gaining an understanding of customer priorities, and building a relationship of trust.


General responsibilities include:

  • Provide preconstruction activities for ground up projects of $10M to $50M.
  • Prepare subcontractor bid tabs and take-offs.
  • Prepare detailed instructions for bidders.
  • Establish and maintain relationships with existing clients.
  • Prepare bid solicitations and build subcontractor relationships.
  • Able to prepare project budgets from very limited design information (i.e. SD, DD, etc.).
  • Prepare final estimates in conjunction with Project Manager.
  • Track project historical costs.
  • Participate in business development and work with Calcon stakeholders and aide in the preparation of RFP responses and subsequent interviews.
  • Provide expertise related to constructability and building systems over-view. Effectively communicate and participate in design meetings in order incorporate value into final designs.
  • Resolve common project problems to maintain good business relationships and outcomes for Calcon.


  • B.S. degree in Engineering, Construction Management.
  • Four (4) years estimating experience.
  • Knowledge of Denver market is preferred.
  • Background in General Contracting consisting of mid-size jobs.
  • Experience with various building types. (i.e. Multi-family, mixed use residential, healthcare, office, tenant improvement, etc.)
  • Solid computer skills; Proficient in Microsoft Word, Outlook, Excel, and scheduling software.
  • ProCore project management software experience a plus.
  • Verifiable work references demonstrating exceptional skills and achievements including:
    • High level of professionalism; Dependable, results-focused and ethical
    • History of delivering on projects and commitments and strong communication with internal stakeholders and externally with Owners and Design Teams.
    • Strong organization, multi-tasking and planning skills
    • Excellent customer service orientation and verbal written communication skills
    • Strong leadership skills
    • Detail oriented.
    • Successful completion of post-offer background and drug screens
  • Salary: $80,000 – $110,000 DOE
  • Project locations are in Colorado
  • Benefits: Excellent benefit package including medical, dental, vision, and options for life insurance, STD, LTD, 401K, HSA, Section 125, Paid Time Off, and holidays, bonus compensation, service awards, & a fitness program.

Please submit your resumes & qualifications


This is a unique website which will require a more modern browser to work!

Please upgrade today!