Our Staff

Physical Therapists

Greg Mackenzie, Owner and Physical Therapist

Greg was born in Pietermaritzburg, South Africa.  He was raised on a farm in the midlands of Natal, riding horses and was competitive in showjumping, cross country and Dressage. He graduated from Hilton College where he also played rugby, cricket and ran track. He then went on to study for his Bachelor of Science in Physiotherapy at the University of Stellenbosh, near Cape Town and thereafter his Master’s of Sports Science at the University of Natal, Durban.

Greg owned and operated a Sports Medicine clinic, Kings Park Sports Medicine Centre, in South Africa for 14 years. Greg also spent many of these years as the  official Physical Therapist and Trainer for the Natal Sharks Rugby team and the international Springbok Sevens Rugby team. He traveled extensively all over the world, including multiple trips to New Zealand, Australia, Japan, China, Hong Kong, Paris, London, Dubai, Malaysia, Fiji and also many South American countries including Chili, Argentina and Uruguay. He brings to Xcel a wealth of orthopedic, manual and sports physical therapy experience.

After moving to the USA permanently and becoming a US citizen, he gained much experience working in various clinics and hospitals in the greater Dayton area and Indiana.

Xcel Sports Medicine was established in 2006, with the core principle being the ‘hands-on’ approach to PT which defines  the philosophy of the clinic. This is the fundamental basis of the clinic’s approach to the management of orthopedic, and sports injuries that constitute the bulk of the patient population at the clinic.

An avid marathon runner, Greg has run in many area races,including the New York, Columbus, Cincinnati Flying Pig, Air Force, and Boston Marathons and he has run the 56 mile Comrades in South Africa 8 times. He enjoys sharing the benefits of this sport with as many people as possible.

Greg is married to Celeste, a master Pilates instructor and owner of Peak Personal Pilates. They have 2 grown children; Brett, a graduate of the University of Louisville and competitive swimmer and Sarah, an NYU graduate currently pursuing a career in the arts in New York City.

Stacie Cornwell
Stacie Cornwell

Clinic Director
Vandalia, OH
Physical Therapist

Stacie is a local native and a 2004 graduate of Vandalia-Butler High School. She earned her Bachelor’s degree in Exercise Science in 2008 from the University of Toledo, which was followed by her Doctorate of Physical Therapy at the University of Dayton in May of 2011. She began her career at Xcel in May 2011 following a 12-week clinical affiliation with the group.

Stacie is currently a member of the Vandalia Optimist Club and has been a member of Vandalia’s High School soccer team, and the University of Toledo’s club lacrosse. Stacie and her husband have two wonderful children, Dillon and Spencer. Currently, she enjoys spending time with family and friends as well as gardening, fishing, kayaking, and running.

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Andy Schulze

Clinic Director
Anna, OH
Physical Therapist

Andy, of Maria Stein, is a 2004 graduate of Marion Local.  He attended Bowling Green State University for his undergraduate coursework, majoring in Applied Health Science.  Andy graduated from The University of Findlay in 2011 with his Doctorate of Physical Therapy.  He started his physical therapy career as a travel physical therapist, which took him from California to Washington D.C. with several stops in between.  Andy has experience working in various settings and his specialties include orthopedic sports medicine and manual therapy.

Andy’s wife is also a 2011 graduate of UF’s Physical therapy program.  They reside in Anna, Ohio.  Andy enjoys golfing, being outside, and spending time with his wife Lindsay.

Bret Lorenzo
Bret Lorenzo

Clinic Director
Beavercreek, OH
Physical Therapist

Bret was raised in Xenia, OH, where he graduated from Xenia High School in 2005. He earned his Bachelor’s degree in Exercise Science in 2009 from Wright State University and then his Doctor of Physical Therapy at the University of Dayton in May of 2012.

He began his physical therapy career with Xcel Sports Medicine in 2012 and is currently the Clinic Director of the new Beavercreek location. Bret is blessed to be married to his amazing wife Lindsay and they have recently welcomed their first child in March of 2016. Bret enjoys being active, including hiking, biking, crossfit, golf, and spending time with family.

Sam Schwendeman
Sam Schwendeman

Physical Therapist

Sam grew up in Old North Dayton and is a 2007 graduate of Chaminade-Julienne High School where he met his future wife. He earned his Bachelor’s degree in Health Sciences in 2011 and a Doctorate of Physical Therapy in 2014 from the University of Cincinnati. Following a 12-week clinical rotation at Xcel he began his career here in May of 2014.

Sam’s wife is also a 2014 graduate of the DPT program at UC. They enjoy spending time with their two children; Louis born in 2013 and Eleanor born in 2016. Sam is a lifetime fan of the Red’s and played baseball at CJ. In his spare time Sam likes to play handball, golf, hike, camp, and do anything else outside.

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Kevin Royce

Physical Therapist

Kevin was born and raised in Grand Rapids, MI. After attending Central Michigan University for his undergraduate degree in Health Science, he attended the University of Dayton, achieving his Doctor of Physical Therapy in May 2016. Kevin joined Xcel in June 2016, and brings a passion for both orthopedic and neurological populations. He continues to work on publishing work, utilizing screening tools to predict injury in NBA players, but is also interested in concussions and balance disorders. In his free time, Kevin enjoys running, any outdoor activities, and watching Baltimore Ravens, Detroit Red Wings, and Notre Dame Football.

Aaron Pertner
Aaron Pertner

Physical Therapist

Aaron grew up in Rossford, OH and graduated from Ohio University with a teaching degree in 2002. After teaching high school students for 5 years and 2 years of working for Coors Brewing he decided to go back to school to become a physical therapist. Aaron graduated in May 2013 from the University of Dayton with his Doctor of Physical Therapy degree.

Aaron currently lives with his wife, Kristen, and son, Henry, in the South Park neighborhood in Dayton. During the summer he is a member of the Dayton Area Rugby Club 7s team and in his spare time he also enjoys spending time with his wife, cooking, exercising, fly fishing badly, and reading good books. Aaron first joined the Xcel team in 2009 as an aide and began his new role as a Physical Therapist in June of 2013 and looks forward to many years treating patients.

Mike Mahan Physical Therapist
Mike Mahan

Physical Therapist

Mike Mahan was raised near St. Paris, OH in Champaign County and has lived in Tipp City since 1979.  He graduated from Miami University and received a Master of Science degree in physical therapy at Duke University in Durham, NC.  He devoted his interests and career in the treatment of young children with developmental disabilities, spending 32 years with the Montgomery County Board of Developmental Disability Services in Dayton as a PT and administrator.  He retired from that program in June 2008, then began working on his second career at XCEL in July 2010.  Mike is married with four daughters.  He enjoys cycling and refereeing youth soccer.

Sarah Conover
Sarah Conover

Physical Therapist
Vestibular Specialist

Sarah, a native Hoosier, went to University of Evansville where she graduated with her Physical Therapy degree and the University of Indianapolis with a Master of Health Science degree. In 1992, Sarah was first exposed to the area of vestibular rehab and this has become a passion of hers over the years. Currently, the evaluation and treatment of individuals with balance and vestibular impairments, as well as post-concussion syndrome make up the majority of her practice. Sarah joined the Xcel team in 2014.

Sarah and her husband have three adult children, Paul, Max and Meg. She enjoys gardening, knitting and reading, and spending time with her family and friends.

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Melissa Mitchell

Physical Therapist

Melissa was raised in Canton, OH but fell in love with the Dayton area while earning her Bachelor’s degree in Biology at The University of Dayton. She graduated in 1996 and went on to obtain her Master’s in Physical Therapy in 1998 and Doctorate of Physical Therapy in 2008, both from Wheeling Jesuit University. She has spent the first part of her physical therapy career in geriatric settings such as Home Health and Extended Care Facilities.

Her passion for physical fitness and sports, including running and CrossFit, is shared with her husband and 2 sons. It was her interests in sports and helping athletes that brought her to Xcel Sports Medicine in 2015.

Ashley Harrod
Ashley Harrod

Physical Therapist Assistant

Ashley is a 2001 graduate of Fort Loramie High School. After completing four years in the United States Air Force, Ashley moved back to the local area where she pursued the career path of a PTA. Ashley attended Edison Community College in Piqua, Ohio and earned her PTA degree in May 2011. In her spare time she is involved in coaching track specializing in distance.  Ashley and her husband have one daughter Kiera and reside in Ft. Loramie, OH. Ashley enjoys spending time with her family and friends as well as doing Crossfit.

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Stephen Vaughn

Physical Therapist Assistant

Steve grew up locally and graduated from Northmont in 2002. He attended college in Cincinnati before returning back to Dayton working as a Realtor. Eventually his love for sports and fitness drew him back to school to earn his degree as a PTA. He graduated from Sinclair’s PTA program in May of 2016 and has been with Xcel since. When he is not working, Steve spends his free time enjoying the outdoors. He is an avid snowboarder who prefers the winter months, but also enjoys golfing, mountain biking and hiking throughout the year. Most importantly he enjoys spending time with his family, friends and dogs as often as possible.

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