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Carmen Autry


Carmen Smith, President and Founder of North Texas Ductworks dba NTD Mechanical has over 30 years of mechanical contracting experience in North Texas.  Founded in 2001, Carmen has enjoyed the growth and challenge of leading her company to its successful platform as a well respected WBE and HUB certified company.   NTD Mechanical builds a higher standard of excellence for commercial HVAC, plumbing, piping and service throughout the North Texas area.  


Andy Wharton 

2nd Vice President

Andy Wharton graduated from Texas A&M University in College Station, Texas with a Bachelor of Architecture degree in Environmental Design. Andy joined Chamberlin after he graduated in 2004 and has provided personalized, professional building services ever since.

In addition to the ASA, Andy is an active member of TEXO Association (ABC/AGC Affiliate of North Texas) and the International Institute of Building Enclosure Consultants. He is the current co-chair of Build Texas Proud and committee member for high school outreach and KidsBuild, both through TEXO. Andy has been played a vital role in Chamberlin winning many awards like the 2017 TEXO Distinguished Building and 2015 Engineering News Record Best Project Merit. In his free time, Andy enjoys being a member of Messiah Lutheran Church in Plano, being a proud father and husband, playing golf, upland hunting and building employees to their greatest potential.

Derek Hyzak

1st Vice President

Derek Hyzak is the Director of DFW Construction of Polk Mechanical. Polk Mechanical is a mechanical services provider that serves both commercial and industrial markets in the DFW and Houston areas. He is a graduate of Texas A&M with a degree in Mechanical Engineering with 17 years of experience in mechanical construction. He is primarily responsible for establishing and maintaining project plans and budgets, organizing and leading project teams, fostering communication and coordination between functional groups, ensuring adequate resourcing to meet goals, and identifying risks and contingency plans. In his free time, Derek enjoys spending time with wife, Layne, and their daughter, Beau, and cheering on the Aggies during football season.

Lee Ann Collins

Secretary/ Treasurer

Lee Ann Collins, CPA, is the Managing Partner of Lane Gorman Trubit, LLC (“LGT”). In a career that spans more than three decades, she’s become a demonstrated leader in the financial services industry providing audit, tax, and consulting solutions to clients in the construction, manufacturing, and not-for-profit sectors. A long-time advocate for women in the workforce, Ms. Collins is only the second woman in LGT’s 65-year history to serve as managing partner. She is a frequent speaker at state and local events helping educate other accounting professionals about financial reporting matters and the latest taxation developments. An avid photographer and traveler, Ms. Collins enjoys time outside the office with her husband Skip and two sons.

Sheri Tillman

Past President

Sheri Tillman is General Counsel for TDIndustries, Inc., a premier mechanical construction and facilities service company. Sheri is involved in a number of professional associations including the State Bar of Texas Construction Law Section, the American Bar Association - Construction Law Forum and the American Subcontractors Association, North Texas Chapter. She also serves on the Board of the DFW Women’s In-House Network. Sheri received her law degree from Texas A & M University School of Law and her undergraduate degree in Political Science from Southern Methodist University. 

Al Amerson


Al Amerson grew up in New Orleans, Louisiana and loves spending time outdoors hunting and fishing when not working. He graduated with a Materials Engineering degree from Auburn University in 2001. Upon graduation he began his career with York International where he was a sales engineer. In 2006 he returned to Auburn to get an Executive MBA while continuing to work as a senior sales engineer for Johnson Controls.

In 2010 Al joined Texas AirSystems as a Senior Sales Executive working in the Fort Worth office. At Texas AirSystems Al focused his sales efforts on engineers and mechanical contractors. In 2017 Al became a shareholder and was promoted to Director of Special Projects, assisting on the sale of large projects in DFW along with M&A opportunities in Florida, Nevada, North Carolina and South Carolina. In 2019 Al was promoted to DFW Sales Manager, where he grew Texas AirSystems sales to over $200 million. In 2020 Al was promoted to VP of Sales.

Al is actively involved in Soles for Souls, where he has traveled to Dominican Republic and Tanzania to distribute shoes and takes part in hosting local shoe drives. Al is a member of TREC, TEXO, and ASHRAE.

Clinton Fiddes


Clinton Fiddes is the Business Development Director at Prism Electric. He is a native from Miami, Florida; started his career in the summer of 1992, working for his family electrical business. While working out in the field he attended 4 years of electrical apprenticeship @ American Builders Construction Inc. (ABCI) in the evening, during which graduating from University of Miami in Business Administration Management. After relocating to Dallas in 1998; worked for an electrical contractor for two years then saw the opportunity to plant his roots in at Prism Electric, moving into his 20th year with Prism Electric. As lead of Business Development, Clinton is instrumental in maintaining contact and key relationships with our clients. 

Clinton stays involved with numerous organizations, including, American Subcontractors Association, Board of Directors; was in the first group of ASA Future Leaders, TEXO, Helping Hands, Habit for Humanity International, Young Life, International Association of Electrical Inspectors (IAEI), American Builders Construction Inc. (ABCI). Clinton enjoys spending quality time with his wife Naomi and their five children Mia, Marian, Madelyn, Isaac & Mercy.

Melanie Kuhr


Melanie Kuhr brings a unique skill set, including over 35 years of leadership, business development, and human resources experience, to her role as CEO of Signature Millwork, a premier architectural millwork company based in Dallas since 1991.Melanie has enjoyed the growth and challenge of leading her company to its successful position as a well-respected WBE, HUB and FSC certified company.  Before acquiring Signature Millwork with two partners in 2005, she held leadership positions with Proctor & Gamble and EDS.

Melanie also serves numerous professional and community service organizations, including Dallas Holocaust and Human Rights Museum, Board of Directors, Executive Committee and Chair of Development, American Subcontractors Association, Board of Directors, Association of Professional Women in Construction, and Dream Team Women’s Network.

Melanie is also the co-author of DasHaus in East Berlin;  the story of her own family’s journey from Nazi Germany to present day America. A Cincinnati, Ohio, native, Marietta College graduate, Melanie relocated to Dallas for her fourth and final time in 2009. 

Melissa Lesch


Melissa joined PCL in February of 2013. She is a licensed agent and her top priorities are business development, association participation, organization of seminars and client appreciation events. She has been married to Eric Lesch since 1999 and together they have two children, Sophia (12) and Evan (9). She has been part of the ASA Future Leaders since its inception. When not working you can usually find her on the golf course or with her shotgun shooting clays!

Eric Lugger


Eric provides legal analysis and strategic direction and management for all Walker divisions. He is primarily responsible for overseeing all legal aspects of Walker Engineering’s business, including drafting, reviewing and negotiating contracts and supporting the project teams in the event of any project-related issues or claims. Additionally, Eric provides legal support for Walker’s risk management, insurance, human resources and accounting/collection departments, and serves as a dedicated resource for the Walker executive and management team. Eric collaborates with the executive team to help develop and drive Walker’s corporate and strategic initiatives which fuel the company’s internal and external growth.  Eric graduated with a Bachelor of Arts with High Honors from the University of Texas at Austin and with a Doctor of Jurisprudence with Honors from the University of Texas at Austin School of Law.

Casey Troxclair

Casey has worked in the DFW Construction industry for the last 19 years. She is the Executive Assistant to the COO at KPost Roofing and Waterproofing. The first 14 years of her career she was a Project Coordinator for Potter Concrete. She was in the first group of ASA Future Leaders. In addition to ASA, she currently serves as the Chair for National Women in Roofing – DFW Council. She enjoys spending her time with her husband Tony and their two sons.

Jason Wroblewski


Jason Wroblewski is Vice President of Project Management for Haley-Greer Inc. He graduated from Indiana University with a Bachelor of Arts degree in Political Science and also received an International Studies Certificate. Jason joined Haley-Greer Inc. in 2004 and the ASA NTX board in 2014.

Fred Wilshusen

Legal Council

Fred D. Wilshusen is a partner in the Dallas, Texas law firm of Thomas, Feldman & Wilshusen, L.L.P., a law firm that concentrates in the area of construction law and related litigation. Thomas, Feldman & Wilshusen, L.L.P. and its predecessors have been the attorneys for ASA North Texas Chapter since 1974. Mr. Wilshusen is also the attorney for the Texas Construction Association. He is a former Chair of the Dallas Bar Association Construction Law Section and is currently the Chair of the Texas State Bar Construction Law Section. Mr. Wilshusen is the co-author of the Texas Lien and Bond Claims Handbook, 6th Edition. Mr. Wilshusen is also a member of the American Arbitration Association Roster of Neutrals for the construction industry.

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