With well over a century of combined experience, the Sterling Custom Homes team provides clients
with a level of expertise that inspires confidence and trust.


Duke McDowell,GMB, CGB, CGP


Duke McDowell

A graduate of Texas Tech University with a degree in Engineering with a Construction Option, Duke McDowell has devoted his entire career to building homes. Duke is a past Chairman and a past member of the Industrial Engineering Advisory Board for Texas Tech and has been recognized for his contributions and service to the home construction industry as an inductee into the Engineering Technology Academy at Texas Tech University.


Prior to establishing Sterling Custom Homes, Inc., Duke worked for two large homebuilding companies in Texas, serving as the Vice President of Construction & Operations. He also served as a consultant for 14 of the top 200 builders in the nation. These experiences have provided Duke with valuable insight concerning the issues facing homebuilders today.


“At Sterling Custom Homes, we are committed to turning our customers’ dreams into realities. What this means to you is the highest quality home at the most competitive price. Through architectural efficiency, volume purchasing and long-term subcontractor relationships, we are striving to build the finest quality homes and service department that can be found anywhere in the industry.” — Duke McDowell


Christine Mann

Customer Selection Manager

Christine Mann

As Customer Selection Manager, Christine assists homeowners with their selections. She is a liaison between our customers and trade partners; she schedules appointments, reviews proposals and gets selections ordered. She prepares customers’ CookBooks and updates their online Homeowner private login section of their website. Christine attends the weekly construction meetings to stay abreast of the daily activities, and provides support to the Construction Estimator and Construction Managers on customer selections.


Christine is also Executive Assistant to Duke. She provides administrative support, which includes scheduling his appointments, preparing/processing reports and special projects. Being a team member is important to Christine and she is always ready to assist homeowners and team members with a friendly and positive attitude.


Christine has been with Sterling since May 2002. She graduated from Southwest Texas State University with a Bachelors of Business Administration. Before joining Sterling, Christine was an executive assistant for the president of a telecommunications company and an office manager for an environmental law firm in Austin.


Gary Grambley,CGB, GMB

Vice President of Sales & Marketing

Gary Grambley

Gary works closely with clients and Realtors, helping them get acquainted with the unique processes and unparalleled finished product provided by Sterling Custom Homes.


Gary is a graduate of Sam Houston State University, where he earned a BBA in Accounting. His attention to detail and commitment to total customer satisfaction makes him feel right at home in the Sterling organization. Gary says, “The fact that I can encourage a prospective customer to call any of our past clients, more than 300 Sterling advocates over the past 30+ years, and ask them about their level of satisfaction with our processes and the quality of the finished product, gives me a tool that no other custom home builder can provide. I think this speaks volumes about our commitment to quality and customer satisfaction.”


In his spare time Gary is an avid runner. He has completed seven marathons. Gary supports the Make-A-Wish Foundation and, with Sterling’s help, he has raised over $12,000 for the charity through his Run For Make-A-Wish program.


Cody Wagner

Vice President of Construction

Cody Wagner

Cody has been a member of the Sterling team since 2010.  He spends most of his time on location at our job sites overseeing the construction process. From clearing of the lot through closing of the home, he supervises the subcontractors, manages the scheduling and logistical systems and ensures the smooth implementation of our quality control processes.  Cody meets with homeowners to answer their questions and to discuss any changes from their original plans and specifications. His ability to listen to the homebuyer, along with his capacity to ensure Sterling quality in each home, is an equation that equals satisfied customers.


Cody graduated with his Bachelors of Science Degree from Texas Tech University.  With a degree from Texas Tech, Cody was a great fit for Sterling, but added to that, Cody grew up in the building business.  His father is a custom builder and Cody worked for him beginning in 1998 prior to coming to Sterling.  So Cody continues that family tradition and builds with a commitment to excellence and passion for building, which makes him a perfect fit within the Sterling team.


Jeff Miranda

Accounting Manager

Jeff Miranda

Jeff has been a member of the Sterling team since 2013.  As Accounting Manager, Jeff ensures that we account for every dollar.  He scrutinizes each bill and looks to save money whenever possible – for Sterling, and for our customers. This means that when you trust us to pay bills on your behalf for allowance items, Jeff ensures that we steward your money as if it were our own.


Jeff has over 30 years of combined cost accounting and project management experience.  While finishing his accounting degree at Lamar University, Jeff began his career as an intern at a large commercial and industrial contractor in Texas.  Afterwards, Jeff spent the next 8 years as this company’s Assistant Controller, and Controller of their steel fabrication division, before transitioning to government project management in Washington DC.  While in DC for more than a decade, Jeff worked with multiple government agencies, managing Y2K transitions and other security installations at many DoD facilities and airports.  Jeff also served as Sr. Financial Analyst for a government-appointed airport security taskforce in the wake of 9/11.  Jeff moved back to Texas, about 10 years ago, so that he could spend more time visiting and assisting his parents.


When Jeff isn’t here at Sterling, he can be found enjoying time with his family.  Whether it’s activities with his two sons, or visiting his dad, Jeff loves his family; and, he considers it a privilege to be a small part in helping provide “dream homes” to our Sterling family.


Bruce Herve


Bruce Herve

Bruce makes things happen, in the field, as Sterling’s Builder Bruce has been with Sterling since early 2016 and is responsible for every aspect of the construction process, from scheduling and directing trades to facilitating homeowner walkthroughs.


Bruce graduated from New Hampshire College, with a bachelor’s degree in business administration, with a focus in organizational leadership.  Bruce started his career in finance and later made the career change to home building. Having owned his own home building company, before joining the team at sterling, as well as doing architectural remodels, Bruce brings a valuable set of experiences. This value adds to Sterling’s long history of building high quality homes.


When Bruce isn’t in the field, enhancing our clients lives, he can be found spending time outdoors with his wife and son.  Bruce is an avid outdoors-man and spends much of his free time hunting and fishing


Rick Kowalski

Warranty Manager

Rick Kowalski

As Warranty Manager Rick makes sure that you always love your home! Here at Sterling we believe in exceeding the client’s expectation. This means that we want to take care of your home well after its built. Rick makes sure that all your post construction needs are met with the highest level of care.


Rick assists in the construction phase of the project by performing lot clears, keeping the job site clean, and assisting our builders in whatever they need. After construction Rick assists in our 1 month checklists and 11 month checklists. You’ll find that Rick will take care of your home as if it was his own.


When Rick isn’t here at Sterling he loves to spend time with his family. As a native to Wimberley he loves spending time outdoors with his wife and kids! Whether it’s hunting, fishing, or coaching baseball, Rick approaches every situation with care.