Have a talent for art? Are you a willing professional?

Join our amazing team of instructors — GNAL is looking for individuals to lead in DrawingLife Class, Printmaking, Sculpture and more! Contact us today for details!

Diane DeRogatis

My name is Diane DeRogatis and I am a certified art educator.  I am originally from New Jersey where I taught Elementary and High School art.  Since moving to Pennsylvania I continue to teach and work independently as a freelance artist.  The mediums I love working with are watercolors and acrylics.  Being a landscape artist I am totally inspired by the beautiful lakes, mountains, hiking trails and farmland of PA.


Steven Goldblatt

They had me at “Lights Off”…  I was 10. 
I was in the first day of a darkroom class at my local Y,  and the magic of seeing a print develop as I watched has kept me in a darkroom ever since.  I’ve been a working pro photographer now for almost forty years.  Although it’s now electronic, I’ve been using the “digital darkroom” of Photoshop almost every single day for the last twenty years, both in business and in teaching digital in Temple’s Continuing Ed program.   I was also part of the adjunct faculty at Widener University as well as working at MontCo, Delaware County CC and Penn State.
Our programs will be an introduction and overview of the tools and techniques available to edit, correct, combine, colorize or create a classic B/W image, layout a wedding album or publish a company newsletter, take ex-spouses out of family photos, publish and finally print your own fine art images, so bring in a few samples to work on.  Anything you can think of doing to an image or with an image can be a reality with a little Photoshop magic!  Let’s play!

Gabrielle Sivitz

Originally trained in scientific illustration, Gabrielle Sivitz credits her father, a science teacher, amateur photographer and painter, for shaping her lifelong enthusiasm for nature and art. As an educator and artist, she has held positions at the Academy of Natural Sciences in Philadelphia and Bowman’s Hill Wildflower Preserve in New Hope. Gabrielle studied at Bucks County Community College, Moore College of Art & Design, and the Pennsylvania Academy of the Fine Arts where she focused on painting and printmaking. Gabrielle recently returned to eastern Pennsylvania after 15 years living in the Intermountain West, where she taught drawing and painting to adult students out of her own studio as well as at art centers and museums in Idaho and Montana. In 2017, she was awarded a professional
development grant from the Idaho Commission on the Arts with the National Endowment for the Arts. Gabrielle wants her students to enjoy art and embrace the learning process. Her classes and workshops are geared toward having fun and accepting mistakes. “When we’re kids we naturally draw and paint for fun and we don’t worry about the results, but as we get older we become much harder on ourselves. We accept the myth that artists are born with some magical ability that we don’t have, and so we give up. In reality, it just takes practice. It’s all about training yourself to see like an artist, and having fun along the way.”

Doug Tweddale

I have been an artist my whole life. I remember being nine years old and oil painting with my Uncle Lester Gallagher, an artist from the Midwest who loved painting the sand dunes of Lake Michigan. For the last 30 years, I have been a pastel artist, and for half of that time I have studied with Master Painter Albert Handell. Now that I have retired, I have the wonderful opportunity of making painting my first priority as I travel this beautiful country with my wife Sue. So far, we have been on two three-month extended trips to many National Parks out West. I’ve attained signature member of the Pastel Society of America and the Pastel Society of the West Coast. A story of our 2015 journey and my travel art work was just published in the August issue of the Pastel Journal. During our travels, I conduct “Living the Dream” Plein Air Workshops to share my artist’s knowledge and experience with students as we enjoy painting our treasured National Parks.  You can checkout his artwork at his website. 

Jason Rodriguez

I started drawing Sesame Street’s Ernie and Bert at the age of two, and from then on I couldn’t stop filling sketchbook after sketchbook. In highschool I attended the School of the Arts in Charleston, SC as a Visual Arts major. However, in college, I started to question the purpose of art which led me to give up on it and major in something “useful.” It wasn’t until my mid 20s (while I was in seminary of all places) that I realized I was created to be an artist and that creating art was one of my deepest joys. It was on an iPad in a program called Procreate that I started drawing again. I especially liked the “undo” button and the diversity of true to life brushes. Creating on the iPad got me back into drawing, and eventually I returned to physical/traditional media. I now use both digital and traditional tools to illustrate; for example, I will ink or watercolor a picture and load it into the iPad to utilize the breadth of tools available in a digital workflow. Being part of an Art Community has also been crucial to this journey. I am actively engaged with the Society of Visual Storytelling, an online art school and art community for illustration. I am a major proponent of self paced learning, challenging yourself and finding what’s available to you to improve your craft. Currently, I am homeschooling my own little artists, freelance illustrating and running a custom portrait studio. You can see my personal and custom work at www.jdrpictures.bigcartel.com and follow me on social media at www.instagram.com/jdr_pictures and https://www.facebook.com/jdrodpictures



Jessica Libor

Jessica Libor is an artist from Philadelphia, PA who creates work that deal with beauty, desire, nature, and feminine experience.  Myths and legends often influence her work, and she works in oils, watercolor, ink, pastel and precious metals. Jessica’s aesthetic is influenced by the Rococo and Pre-Raphaelite periods of art history, as well as theater, set design, high fashion culture. The feminine figure is central in carrying the piece or telling a story, with her surroundings often mirroring her state of mind. Jessica received her Master of Fine Arts from the Pennsylvania Academy of the Fine Arts in 2014.  Since then, she has been painting, exhibiting her work, teaching art at Harcum College and as a visiting artist at various other universities.  Jessica is also the founder of Era Contemporary Gallery, having curated over 10 exhibits so far.  She currently divides her time between Philadelphia, PA and New York, NY. You can check Jessica’s artwork at her website.


Betz Green

When very young I would collect bits of nature while hiking in the countryside of Berks County, go home to set up a still life with the found objects, and then draw, draw, draw. This experience developed my perception and discipline. After attending youth classes at Kutztown University, receiving a scholarship to attend Pennsylvania Governor’s School for the Arts and then Tyler School of Art, I married fellow artist Jim Green. While raising two artsy children I honed my own skills by creating commissioned children’s portraits and house portraits. Later I became the cover illustrator for Montgomery County Town and County Living Magazine and co-founded Montgomery County Guild of Professional Artists. I jury area art shows and have won numerous awards in regional, national and international shows including gold and silver medals at Audubon Artists Inc. in NYC at the Salmagundi Club, Allied Artists of America, also in NYC, Philadelphia Water Color Society, Phillips Mill, the Philadelphia Sketch Club and regularly exhibit at Historic Yellow Springs. My work has been featured in galleries, including as invited artist at a recent dual exhibition at Stover Mill Gallery, museum shows and many private collections.

I reside just outside Philadelphia with Jim, a few chickens, and too many gardens. Teaching art to adults has become a passion, and as I am constantly experimenting with different materials and techniques to create various portfolios of work, in the classroom I enthusiastically pass on what I have learned.

Please check out my website betzgreen.com


Jim Green

After graduating from Temple University’s Tyler School of Art and completing several business courses, I owned and operated a commercial construction business for 30 years. I have now turned my full attention to a career in the fine arts. My studio and the home I share with my artist wife Betz are located outside Philadelphia.

I have exhibited and won prizes for my work in many juried shows and gallery exhibitions including Allied Artists of America, Audubon Artists Inc., both located in NYC, Stover Mill Gallery as an invited artist in a recent dual exhibition, Phillips Mill in New Hope and Historic Yellow Springs in Chester County. Besides jurying regional art shows, I give art lectures, demonstrations and workshops on my painting methods. Over the last few years I have also enjoyed instructing classes at non-profit art organizations.

I create oil paintings using vibrant colors in an impressionistic style with an expressionistic twist. As for subject matter, that includes whatever inspires me in that moment.

Having very little interest in social media, my website is limited, but you are welcome to visit it at artbyjimgreen.com