About SDP Sales
Reps Who Know the Territory
SDP Sales is an independent manufacturers' representative group built on relationships, product knowledge, and a relentless commitment to hands on training and field support to help deliver results.
Our Story
SDP Sales was founded with a simple mission: be the best manufacturers' rep group in the South. We built our business the old-fashioned way — by showing up, knowing our products inside and out, and treating every distributor and end-user like a long-term partner.
Today we represent a carefully curated portfolio of leading manufacturers across jan-san, facility supplies, floor care, safety, and packaging. Every line we carry is one we believe in — and one we're proud to put our name behind.
When you work with SDP Sales, you get more than a rep. You get a team that's invested in your success.
Our Mission
"Be the best manufacturers' rep group and true distribution partner — period."
SDP Sales
Our Territory
We provide dedicated, consistent coverage across the Southern United States — giving our manufacturers the focused attention their lines deserve.
Click any region to see the rep responsible for that territory.
Meet the Team
Experience. Relationships. Results. Our team knows the market, the products, and the people. With more than 200 years of combined Jan/San industry experience, SDP brings decades of proven sales expertise, established relationships, and market knowledge to the customers, distributors, and manufacturing partners we serve.
Chisum Whorton
President & Owner
Chisum is President and Owner of SDP Sales, bringing more than 16 years of Jan/San industry experience and over 25 years of sales, marketing, and business development expertise. He leads SDP's sales strategy and continued growth while maintaining a hands-on approach to customer relationships and market development — focused on identifying new opportunities, strengthening strategic partnerships, and supporting the team with the resources to deliver measurable results. Chisum holds an MBA from Mays Business School at Texas A&M University and a bachelor's degree from Texas A&M University.
Chris Erkel
Sales
Chris joined SDP in 2025, bringing nearly 40 years of sales, distribution, and market experience to the team. Prior to joining SDP, Chris spent 26 years with Bunzl New Orleans’ redistribution division as a Territory Manager, developing extensive experience working with distributors and customers across a wide range of market segments. His background includes Jan/San, industrial, hospitality, food service, grocery, convenience store, and packer/processor markets. Before joining Bunzl, Chris spent 13 years in the supermarket industry, giving him valuable firsthand experience from the customer and end-user side of the business. At SDP, Chris covers Louisiana and Mississippi with a focus on building lasting distributor relationships, developing new sales opportunities, and providing consistent product and market support throughout his territory. His extensive knowledge of the Gulf Coast market, decades of distribution experience, and commitment to customer service make him a trusted resource for distributors, end users, and SDP’s manufacturing partners throughout the region.
Chris Lemberg
Sales
Chris brings nearly 50 years of Jan/San industry knowledge, sales experience, and customer relationships to SDP, serving the DFW and West Texas markets. He began his career in 1978 with Monarch Paper Company in distribution sales, then spent 14 years with Kimberly-Clark covering the Southwest region, followed by 22 years with Berry Plastics in regional sales. That experience on both the distribution and manufacturing sides of the industry gives Chris a unique understanding of the market and the needs of customers, distributors, and manufacturing partners. Chris also spent several years in education and high school athletics as a teacher, coach, and athletic director — earning him the nickname "Coach" still used by many longtime customers and colleagues. He holds an associate degree from Navarro College and a bachelor's degree in Education from East Texas State University.
Crystal Houser
Customer Service
Crystal serves as an Inside Sales and Support team member for SDP, supporting customers and the sales team throughout Houston, the Texas Gulf Coast, Oklahoma, Arkansas, Louisiana, and Mississippi. She brings extensive experience in customer service, logistics, and order management. Prior to SDP, she spent eight years with Berry Global — four in Customer Service handling order entry, pricing, and coordination with sales teams, and four in Logistics managing shipments, scheduling, and cross-functional coordination. Earlier in her career she worked in customer project coordination and spent more than a decade in education as a Pre-K teacher and Reading and Math Coach. At SDP, Crystal combines her customer-first approach and operational background to provide responsive support across every territory she serves.
Mark Curtis
Sales
Mark joined SDP in 2023, bringing more than 30 years of Jan/San industry experience across manufacturing, distribution, and sales management. He began his career with Mission Sales and Janitorial (later Hillyard) and spent eight years as Regional Sales Manager for Misco Products. At SDP, Mark combines deep market knowledge with the unique perspective of having worked on both the manufacturer and distributor sides of the industry. He holds an MS in Finance from the University of Texas at San Antonio and a bachelor's degree from Texas A&M University.
Patty Wilson
Sales Support Manager
Patty serves as Sales Support Manager for SDP, supporting the sales team and customers throughout North, South, and West Texas. She brings more than 30 years of industry experience with an extensive background in contract coordination, customer service, inside sales, and office management — including 12 years as Office Manager for another manufacturers' representative agency. Patty is known for her responsiveness, attention to detail, and commitment to exceptional customer service.
Phillip Maple
Sales
Phillip joined SDP in 2023, bringing more than 25 years of Jan/San industry experience across sales, distribution, manufacturing, and sales management. Prior to SDP, he spent 17 years with Bunzl Oklahoma — including five years as Sales Manager — and served as Territory Manager for Solo Cup Company across Oklahoma and Arkansas. His professionalism, market expertise, and ability to develop new opportunities have helped drive his territory to record sales volume. Phillip holds a Bachelor of Business Management from Oklahoma Christian University.
Vicente Casalderrey
Sales
Vicente brings more than 20 years of sales, customer service, procurement, and wholesale distribution experience to SDP. He spent six years with Republic Services in roles spanning Customer Service Supervisor, Procurement Supervisor, and Industrial/Commercial Sales Representative, followed by nine years as a Sales Professional with Saalfeld Redistribution and five years in wholesale sales with Bunzl. At SDP, Vicente combines his extensive distribution background and customer-focused approach to develop new opportunities, strengthen distributor relationships, and drive growth throughout the Houston territory.
Ready to Work Together?
Whether you're a manufacturer looking for coverage or a distributor wanting to add a great line, let's talk.