I met Nathan and this is what happened...

I was lucky enough to spend about 5 hrs w nathan had lunch and ran amuck thru LA

sandytucker1  c'est magnifique pourriez vous nous en dire plus merci d'avance

Hey Sandy!  Welcome!  Still jealous of you!!  -Curses  

I met Nathan in August of 2015 it was the best dat of my life. He smiles shook my hand and said I'm Nathan we took a pic I thanked him and he said Always,angel. It's almost two years and I'm still swooning hes so sweet sweet, kind and much hotter in person!

Did you meet him at Wizard World Chicago like I did in August of 2015?

My profile picture is the picture that Nathan took. I was with Nathanfan and 3 other Castle fans. We were looking into Raleigh Studios in Hollywood back in 2013. Everyone wanted to see the studio where Castle was filmed. We were driving around Hollywood looking at locations that had been used in the area. I told everyone that we would be lucky to see someone we knew walking around inside the studio lot. We had been at a CastleCon in the area so we had met a few of the people who are in Castle. We were ready to leave but one of the people with us was waiting for her cousin to come and pick her up. I didn't want to drive away and leave her so we waited. It was now lunch time. People started to leave the studio heading for lunch.( I can't remember the order of how we met people so I will just tell about the encounters.) Nathanfan recognized LT as he was walking out of the gate. He was thrilled that people knew who he was. I took a picture with him and the girls. I don't really like my picture taken so I'm happy just taking the pictures. People got his autograph and we chatted about him walking home to let his dog out during the lunch break. Next we saw Rob Duncan who wrote the music for Castle. I have a masters in music so I was very interested in talking with Rob about his use of motifs and techniques in the show. He was just leaving his Castle meeting. He was very happy to know that the fans were listening to what he was writing. He actually asked us if he could take a picture with us?? His assistant took the picture. HE posted it on his twitter and facebook page saying "Met a few new friends today" or something like that. WE were happy to have met a few Castle people connected to the show and were now ready to leave when the ride finally would arrive.. And..we saw Nathan and another guy heading for the gate. We had someone run across the street to get Nathanfan as she had gone to find a place to sit. Nathan came out and I said "So did you come to say Hi"? Yes, he said as he walked towards us. He shook everyone's hand (very soft) and asked where we were from. Then he asked if we would want a picture? Everyone said "yes!!" and they gathered around Nathan. I took everyone's cameras to take the pictures. Nathan was impressed at how fast I switched to each camera to take the pictures. After I took one with my camera one of the girls said maybe Spencer would like to get into the pictures also? (Spencer Garret was the guest star on the episode they were shooting. Nathan is know to be very welcoming to the guests on the show. He was taking Garrett to lunch around the corner from the studio.) Nathan was very happy we did this as poor Garrett was left out of this who picture thing. After I finished and started returning camera to everyone Nathan walked up and grabbed my camera and said, "Well, you need a picture." He leaned down and put the camera out for a "selfie" picture of the two of us. I was saying no that's ok. He snapped a picture then I said oh why not?? and I put my head next to his and he took another picture. That is the one you see in my profile picture. I told him thank you but that really wasn't necessary. WE only took up a little bit of their time as no one asked for an autograph. They took off walking around the corner to the restaurant only to return in a few minutes. I said "fast lunch?" Nathan said the place was closed on Mondays so they would have to just have craft services. Shortly after Nathan drove his SUV out to head to another place for lunch. 
I will let Nathanfan add to this as she never posted her encounter and I'm sure will have more to add. I did see a Castle Panel at the San Diego Comic Con Castle panels and one of the Paley panels. Since I had seen him a couple of times I didn't freak out. I have also seen a couple of days of location shooting with the whole cast. That is very fascinating to see the process.