Chief Executive Officer

Since joining the Tucker & Booker team as an architect in 1986, Rob Donhoff has contributed significantly to the firm, now DKN Architects, as a lead designer and principal architect in an extensive array of projects. Throughout his career, Donhoff has exhibited a vast expertise working with a range of cliental including commercial developers, religious institutions, and public and private institutions. Donhoff began his professional career working in the Cincinnati area offices of Fisk Rinehart Keltch Meyer and Glaser Meyers Architects. Before his beginnings at Tucker and Booker, Donhoff continued his career with Perry Dean Rogers and Partners, as well as Schwartz Silver Architects in Boston.

In addition to his professional practice, Donhoff has contributed within the academic community as a studio instructor at the Boston Architectural Center. Donhoff received his Master of Architecture from Harvard University in 1983 after earning his B. Arch. from the University of Kentucky in 1979, where he was awarded the American Institute of Architects Henry Adams Medal upon graduation.  

Professional Registrations, Societies and Honors

Registered in states: AL, AZ, CA, CO, CT, DE, DC, FL, HI, ID, IL, IN, KY, LA, ME, MD, MA, MI, MN, MS, NV, NJ, NM, NY, NC, OH, OK, PA, SC, SD, TN, TX, UT, VT, WA, WV, WI 

National Council of Architectural Registration Board Certified

American Institute of Architects


Greater Louisville, Inc.

Member International Conference of Building Officials


Patrick Nall is the President of DKN. Nall’s business and architectural expertise was developed through leadership on design teams for a wide diversity of projects. His unique ability to understand Project and Process both as an Architect and from the perspective of the developer, owner, and user is one of his most valuable assets. Patrick began his professional career at Bickel Gibson Architects, Weber Winn Architects, and The Estopinal Group prior to joining DKN in 1994. 

Nall received his B. of Science in Environmental Design and B. of Arch from Ball State University. Additionally, he received his Distilled Spirits Certificate – University of Louisville Graduate School. Around the office, Pat is often referred to as the ‘bourbon guru’ and has recently received approval for his patent for the assembly, system, and method of maturation of distilled spirits.

As DKN’s Principal in-house LEED® Expert, Patrick’s sustainable design experience has been earned by developing, designing, building, and documenting the DKN Headquarters at 716 East Market Street.  The building received the  LEED® Certified distinction in 2007, the first of its kind in the downtown Louisville Business District. Since implementing the development of the firm’s Certified offices in 2007, Patrick has led the propagation of many more successful  LEED® Certified projects. 

Professional Registrations, Societies and Honors

Registered in states: KY, IN, NE, VA

National Council of Architectural Registration Board Certified

USGBC Kentucky Board of Directors

Vice President

Tom Kargl’s expertise as an architect and now Principal has been developed through leadership on a diverse range of projects with varied size and type. His ability to understand the construction process and how buildings are constructed is one of his greatest strengths as a design professional. After graduating with a B. of Architecture from the University of Kentucky, Tom started his career at DKN in 1985 and rose through the company to become partner in 2002. Throughout his career with the company, Tom has been instrumental in the completion of projects of all scales, ranging from small tenant fit-up work to large office and industrial structures.

As DKN’s Construction Partner, Tom’s experience has been gained through first-hand knowledge of construction methodologies, detailing, and real-world practical experience.  Whether it is a small or large facility, Kargl manages each project with meticulous scrutiny. Filling the role as the go-to Principal for working through the nuances of Construction Documentation and Construction Administration, his expertise position him an invaluable resource during each phase of a project.

Professional Registrations, Societies and Honors

Registered in states: KY, OH, KS, WY, GA, IA

American Institute of Architects Member

NCARB Certificate Holder



Project Manager


Director of Accounting


Interior Designer


Director of Construction Services


Project Manager


Project Manager


Project Manager


Project Architect


Senior Project Manager / Architect


Director of Design


Project Manager


Project Manager


Barketing Director



Where did you earn your degree and what certifications do you have?

I earned my degree in Industrial Design in Havana, Cuba in 2011. Since then I have occupied different design positions, building a portfolio that includes graphic design, industrial design, interior design and architectural design.

How long have you been with DKN Architects and what are your responsibilities?

I have been with DKN Architects for almost 3 years. I usually get involved in architectural visualization and conceptual building design work. I also participate in design development and construction documents for a variety of projects.

Why did you want to go into architecture?

I got interested in architecture by doing 3d rendering work. In my visualization projects I often had the opportunity of influencing the aesthetics of buildings and architectural elements. Progressively I developed an eye for showcasing materials, structures and landscaping that together tell the story of the use and function of spaces.

Which building(s) most inspire(s) you and why?

Bee’ah headquarters by Zaha Hadid Architects, because of its goal to operate entirely from renewableenergy sources and move towards zero waste as well as its use of forms that mimic the surrounding environment. The Shed, Center for the Arts by Diller Scofidio + Renfro, because of its use of material and structure, making possible its articulation and adapting to different weather conditions.

What do you enjoy doing during your personal time?

I enjoy going out on hikes, learning new songs in the guitar, sketching, 3d modeling and rendering for personal design projects.