The Team

Vice-President & General Counsel

Kathleen Birkel Dangelo

Kathleen co-founded Ohio Valley Group with her late husband Andy in the first years of their marriage. She has been instrumental in crafting the business and the financial strategy that has allowed it to emerge as a leading landscape company in northeastern Ohio.

Landscape Architect

Doug Nemeckay

Doug has been actively involved in the landscape industry since the age of 13 when he began working for the family landscape business.

He received his bachelor’s degree in landscape architecture from The Ohio State University in 1977. In 1988, after passing the state boards, he became a Registered Landscape Architect for the state of Ohio. Doug has always had a love for the design-build aspect of his profession. He has perpetually maintained an equal interest and passion for both the design development and the implementation of the design in the field. Doug and his wife Therese currently reside in Solon where they happily raised their 3 children.


Vice-President of Sales and Operations

Jay Schwartz

Jay has been involved in the landscape industry for over twenty-five years. Jay earned his Bachelor’s degree from Tiffin University and has continued his green-industry education since. Jay lives in Columbia Station with his wife and two sons.

Jay previously owned J & K Landscapes & Design, Inc. for ten years—building loyalty with satisfied clients and creating beautiful landscapes that continue to delight. In 2009, Ohio Valley Group acquired J & K to allow it to effectively service the western and southern areas of Cleveland.

Jay’s primary function is to grow Ohio Valley Group’s west and south side presence. Jay’s expertise lies in his landscape construction and excavation knowledge. His designs and implementations have won numerous awards. He will expand Ohio Valley’s presence by identifying new projects as well as cross-selling all of Ohio Valley Group’s services.


Landscape Maintenance Manager

John Knall

John is responsible for managing the equipment, inventory and storage yard. John’s association with Ohio Valley Group began in 2002 when he was hired as a maintenance crew leader. His tenure in that position has given him the insight advantage in his present managerial position.

John is a PLANET Lawnscape Industry Certified Manager in Lawn Care.

Office Manager

Mary D'Ambrosia

Mary is the Office Manager for Ohio Valley Group. She has been with the company since 1998 and oversees all office procedures as well as many human resource functions.


Administrative Assistant

Kate Okrez

Kate grew up in Russell Township where she attended West Geauga Schools and was very involved in community service projects. After high school, she attended Kent State University where she earned her degree in Business Management. She brings her love of plants and gardening to The Ohio Valley Group in an administrative role.


In Memoriam

Andy Dangelo

Founder & Past-President
Throughout his life, Andy always loved plants and landscaping. He pursued this passion by obtaining a Landscape Design Degree from Ohio State University in 1985. He later became a Certified Arborist, recognized by the International Society of Arboriculture. Andy was a resident of the Chagrin Valley his entire life and was responsible for the design and installation of many of the wonderful landscapes in this area. He played an active volunteer role in his community until his passing in 2022. His wife and family carry on his passion for The Ohio Valley Group.

Ohio Valley Group is absolutely amazing! They are hands down the best landscapers in Cleveland! OVG has amazing craftsmanship, flexibility, and super staff that is so easy to work with. We couldn't be happier with our new landscape install!

Alyssa G.

Ohio Valley Group, specifically Jay and his crew, did an outstanding job on our back patio and pavilion. Jay took my small idea and turned into more than I could have imagined. We went from a tiny cement slab to an outdoor space that feels like another room in our house.

Shannon Y.

Tremendous group of professionals from the leadership down throughout the company. 30 years of successful results with a strong customer base of support. Loads of skill employees & a tremendous knowledge in many fields.. worth a bid or quote for your future projects.

Todd K.

We welcome the opportunity to work with you and exceed your expectations. Contact us at 440-543-0500!


Ohio Valley Group

The Ohio Valley Group’s team of architects, designers, and installers create innovative, beautiful and award-winning spaces. Our professional staff will work with you to turn your dreams into reality.