Advanced Solutions Rehab
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ATS Willow Lane

Niel Visser, PT, DPT
Physical Therapist

Niel Visser was born and raised in South Africa. From a young age he was passionate about sports, and excelled in rugby, track and field, tennis and surfing. His love of sports, and a sustained back injury, would introduce him to physical therapy and lead him to pursue it as a career. After two years in the military and a gap year in Europe, Niel enrolled at the University of Stellenbosch, graduating in 1994 with a Bachelor of Science in Physiotherapy. Seizing an opportunity to work and travel, Niel came to the USA in 1995, and worked in various settings across the country as a PRN therapist. He gained experience working in in-patient rehab facilities, acute/sub-acute care, nursing homes, home health, outpatient orthopedics, sports medicine and work hardening. In 1999 Niel took a position in Spartanburg and became the clinical area coordinator overseeing four outpatient facilities. He co-founded Advanced Therapy Solutions, Inc. in April of 2003 and, with his business partner, Dillen Hartley, has seen their business grow from one clinic and two staff members to 5 locations and 50 employees. Niel received the Butch Buchanan Award for Clinical Excellence from SCAPTA in 2007, in recognition of his contributions and outstanding performance in the practice of physical therapy. In 2014 Niel completed his Doctorate in Physical Therapy with emphasis on Executive Practice Management through Evidence In Motion. He and his team also received the Faculty Favorite Award in the Business Plan Competition. Niel has a special interest in treating spine patients pre- and post-operatively, as well as sports injuries. He enjoys staying up to date on the latest therapy related research. When he is not at work, Niel enjoys playing racquetball, hanging out with family and friends, and following his favorite sports teams.


Jeff Leiszler, PT, SCS, ATC
Clinic Manager, Physical Therapist

Jeff Leiszler, PT, SCS, ATC, is a graduate of both Kansas State and Wichita State Universities. He is recognized as a Board Certified Sports Physical Therapist, a Certified Athletic Trainer, and a member of the Team USA Olympic Medical Network. Jeff has practiced orthopedics and sports medicine for more than 20 years and takes special interest in the wellness and care of the injured athlete. As a member of collegiate and high school athletic training staffs, he enjoys the gratification of assisting athletes of all levels in getting back to their athletic endeavors.


Allison Parker, PTA
Physical Therapist Assistant

Allison received her B.S in Exercise Science in 2015 from Southern Wesleyan University. In 2017, she graduated from Greenville Technical College with her Physical Therapy Assistant degree. Allison stayed in the upstate, where she worked in the outpatient therapy setting for a year before traveling and working in an extensive acute care hospital in Louisiana. At the end of 2019, Allison relocated to Spartanburg, SC where she joined the ATS team, continuing her passion in the outpatient setting. In her free time, Allison gives private pitching lessons and coaches a travel softball team here in the upstate.